Add simulation tutorial to docs

docs/tutorials/simulation.md

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+> Refer to [Quickstart](./quickstart.md) for installation instructions.
+
+### Connect to the public API
+``` py
+import cript
+
+host = "criptapp.org"
+token = "<your_api_token>" 
+cript.API(host, token)
+```
+!!! note
+ Your API token can be found in the UI under [Account Settings](https://criptapp.org/settings/).
+
+
+### Create a Project node
+``` py
+proj = cript.Project(name="<your_project_name>")
+proj.save()
+```
+!!! note
+ Project names are globally unique.
+
+
+### Create a Collection node
+``` py
+coll = cript.Collection(project=proj, name="Simulation Tutorial")
+coll.save()
+```
+
+### Create an Experiment node
+```py
+expt = cript.Experiment(
+ collection=coll, 
+ name="Bulk simulation of polystyrene"
+)
+expt.save()
+```
+
+### Get the relevant Software nodes
+```py
+python = cript.Software.get(
+ name = "python", 
+ version = "3.9"
+)
+rdkit = cript.Software.get(
+ name = "rdkit", 
+ version = "2020.9"
+)
+stage = cript.Software.get(
+ name = "stage", 
+ source = "https://doi.org/10.1021/jp505332p"
+)
+packmol = cript.Software.get(
+ name = "Packmol", 
+ source = "http://m3g.iqm.unicamp.br/packmol",
+ version = "N/A"
+)
+openmm = cript.Software.get(
+ name = "openmm", 
+ version = "7.5"
+)
+```
+
+### Create Software Configurations
+```py
+python_config = cript.SoftwareConfiguration(software=python)
+rdkit_config = cript.SoftwareConfiguration(software=rdkit)
+stage_config = cript.SoftwareConfiguration(software=stage)
+openmm_config = cript.SoftwareConfiguration(
+ software = openmm, 
+ algorithms = [
+ cript.Algorithm(key="+energy_minimization", type="initialization")
+ ]
+)
+packmol_config = cript.SoftwareConfiguration(
+ software = packmol,
+ algorithms = [
+ cript.Algorithm(
+ key="+molecule_packing", 
+ type="initialization",
+ parameters = [
+ cript.Parameter(key="+maxit", value=50),
+ cript.Parameter(key="+nloop", value=10),
+ cript.Parameter(key="+tolerance", value=4.0, unit="angstrom"),
+ ]
+ )
+ ]
+)
+```
+
+### Create Computations
+```py
+init = cript.Computation.create(
+ experiment = expt,
+ name = "Initial snapshot and force-field generation",
+ type = "initialization",
+ software_configurations = [
+ python_config, 
+ rdkit_config, 
+ stage_config, 
+ packmol_config,
+ openmm_config,
+ ]
+)
+equi = cript.Computation.create(
+ experiment = expt,
+ name = "Equilibrate data prior to measurement",
+ type = "MD",
+ software_configurations = [python_config, openmm_config],
+ conditions = [
+ cript.Condition(key="time_duration", value=100.0, unit="ns"),
+ cript.Condition(key="temperature", value=450.0, unit="K"),
+ cript.Condition(key="pressure", value=1.0, unit="bar"),
+ cript.Condition(key="number", value=31),
+ ],
+ prerequisite_computation = init,
+)
+bulk = cript.Computation.create(
+ experiment = expt,
+ name = "Bulk simulation for measurement",
+ type = "MD",
+ software_configurations = [python_config, openmm_config],
+ conditions = [
+ cript.Condition(key="time_duration", value=50.0, unit="ns"),
+ cript.Condition(key="temperature", value=450.0, unit="K"),
+ cript.Condition(key="pressure", value=1.0, unit="bar"),
+ cript.Condition(key="number", value=31),
+ ],
+ prerequisite_computation = equi,
+)
+ana = cript.Computation.create(
+ experiment = expt,
+ name = "Density analysis",
+ type = "analysis",
+ software_configurations = [python_config],
+ prerequisite_computation = bulk,
+)
+```
+!!! note
+ Notice the use of `create()` here, which instantiates and saves the object in one go.
+
+### Create and upload Files
+First, we'll instantiate our File nodes.
+``` py
+packing_file = cript.File(project=proj, source="path/to/local/file")
+forcefield_file = cript.File(project=proj, source="path/to/local/file")
+snap_file = cript.File(project=proj, source="path/to/local/file")
+final_file = cript.File(project=proj, source="path/to/local/file")
+```
+!!! note
+ The `source` field should point to any file on your local filesystem. 
+!!! info
+ Depending on the file size, there could be a delay while the checksum is generated.
+
+Next, we'll upload the local files by saving the File nodes. Follow all prompts that appear.
+``` py
+packing_file.save()
+forcefield_file.save()
+snap_file.save()
+final_file.save()
+```
+
+### Create Data
+First, we'll create a few Data nodes.
+```py
+packing_data = cript.Data.create(
+ experiment = expt,
+ name = "Loosely packed chains",
+ type = "computation_config",
+ files = [packing_file],
+ computations = [init],
+ notes = "PDB file without topology describing an initial system.",
+)
+forcefield_data = cript.Data.create(
+ experiment = expt,
+ name = "OpenMM forcefield",
+ type = "computation_forcefield",
+ files = [forcefield_file],
+ computations = [init],
+ notes = "Full forcefield defintiona and topology.",
+)
+equi_snap = cript.Data.create(
+ experiment = expt,
+ name = "Equilibrated simulation snapshot",
+ type = "computation_config",
+ files = [snap_file],
+ computations = [equi],
+)
+final_data = cript.Data.create(
+ experiment = expt,
+ name = "Logged volume during simulation",
+ type = "+raw_data",
+ files = [final_file],
+ computations = [bulk],
+)
+```
+
+Next, we'll add these to the appropriate Computation nodes.
+```py
+init.update(output_data=[packing_data, forcefield_data])
+equi.update(
+ input_data=[packing_data, forcefield_data],
+ output_data=[equi_snap]
+)
+ana.update(input_data=[final_data])
+bulk.update(output_data=[final_data])
+```
+!!! note
+ Notice the use of `update()` here, which updates and saves the object in one go.
+
+### Create a virtual Material
+First, we'll instantiate our Material node:
+```py
+polystyrene = cript.Material(project=proj, name="Polystyrene")
+```
+
+Next, we'll add some Identifiers nodes:
+```py
+names = cript.Identifier(
+ key="names", 
+ value=["poly(styrene)", "poly(vinylbenzene)"]
+)
+bigsmiles = cript.Identifier(
+ key="bigsmiles", 
+ value="[H]{[>][<]C(C[>])c1ccccc1[<]}C(C)CC"
+)
+chem_repeat = cript.Identifier(key="chem_repeat", value="C8H8")
+
+polystyrene.add_identifier(names)
+polystyrene.add_identifier(chem_repeat)
+polystyrene.add_identifier(bigsmiles)
+```
+
+... and Property nodes:
+```py
+phase = cript.Property(key="phase", value="solid")
+color = cript.Property(key="color", value="white")
+
+polystyrene.add_property(phase)
+polystyrene.add_property(color)
+```
+
+Last, we'll create a ComputationalForcefield node and add it to the Material:
+```py
+forcefield = cript.ComputationalForcefield(
+ key = "opls_aa",
+ building_block = "atom",
+ source = "Custom determination via STAGE",
+ data = forcefield_data
+)
+
+polystyrene.computational_forcefield = forcefield
+polystyrene.save()
+```
+
+### Conclusion
+You made it! We hope this tutorial has been helpful. 
+
+Please let us know how you think it could be improved.