New issue and PR templates. (#459)

* New issue templates.
* New pull request template.
* Improve text.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Run example '....'
+2. Run test '....' using seed '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Observed behavior**
+A clear and concise description of what you observed to happen.
+
+**Output**
+If necessary, add the SACC file, configuration files, error message, or any other output
+that can help us understand the problem.
+
+**Configuration:**
+Please include all relevant information about your configuration:
+  - Firecrown version: [e.g. 0.17.0]
+    - If using a development branch, please specify the branch name.
+  - Installation method: [e.g. developer installation, non-development installation]
+    - Include the output of `conda list | grep firecrown`
+  - OS and Version: [e.g. Ubuntu 20.04, macOS 14.7]
+    - Linux: Check using `/etc/os-release` or `uname -a`
+    - macOS: Check via `System Preferences > About This Mac` or `sw_vers`
+  - Architecture: [e.g. x86_64, arm64]
+    - Check using `uname -m`
+  - Python version: [e.g, 3.11]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/doc_bug_report.md

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+---
+name: Documentation or code comments bug report
+about: Report a bug in the documentation or code comments
+title: ''
+labels: doc-bug
+assignees: ''
+
+---
+
+**Describe the bug** 
+Indicate where the issue is located in the documentation or code comments. Please
+explain what is unclear, incorrect, or missing.

.github/ISSUE_TEMPLATE/doc_request.md

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+---
+name: Documentation or Tutorial Request
+about: Request a new documentation or tutorial topic
+title: ''
+labels: documentation request
+assignees: ''
+
+---
+
+**New documentation or tutorial requests**
+Please describe the new documentation or tutorial topic you would like to see added to
+the Firecrown project. 
+
+Examples of documentation or tutorial topics include:
+    - How to use a generator to create metadata objects.
+    - How to run one of firecrown's examples.
+    - How to use factories to create TwoPoint objects.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request
+assignees: ''
+
+---
+
+**New feature requests and enhancements**
+Please use this template to propose new features or enhancements to the Firecrown project.
+If the problem or solution is not yet clear, please consider opening a discussion in the
+[Firecrown Discussions](https://github.com/LSSTDESC/firecrown/discussions) forum rather than
+opening an feature request issue. Otherwise, please fill out the following template:
+
+**Problem description**
+Please describe what problem you are trying to solve or what feature you would like to
+see implemented.
+
+**Proposed solution**
+If you have a solution, please include a sketch of the proposed solution or a
+description of the feature you would like to see implemented.

.github/pull_request_template.md

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+---
+name: Pull Request
+---
+
+# Pull Request Template
+
+## Description
+
+Please include a summary of the change and which issue is fixed. Please also include
+relevant motivation and context. List any dependencies that are required for this
+change.
+
+Fixes # (issue)
+Discussion: # (link)
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+
+## Checklist:
+
+The following checklist will make sure that you are following the code style and
+guidelines of the project as described in the
+[contributing](https://firecrown.readthedocs.io/en/latest/contrib.html) page.
+
+- [ ] I have run `bash pre-commit-check` and fixed any issues
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have 100% test coverage for my changes
+- [ ] I have made corresponding changes to the documentation