update readme

1. update installation step
2. fix the broken URL of demo file
3. add beta warning
4. add feedback instruction

README.md

@@ -1,7 +1,9 @@
 
-# Azure Data Service Notebook
+# Azure Data Service Notebook (Beta)
 Azure Data Service Notebook is a set of tool for working with Azure Data Service (including HDInsight, Azure Data Lake, etc)
 
+**WARNING**: This SDK/CLI is currently in **Beta Preview** stage. It can and will change in backwards incompatible ways. 
+
 
 # Feature
 Azure Data Service Notebook currently provides a set of magic commands for users to access Azure Data Lake. Available magics are captured in the table below.
@@ -22,21 +24,17 @@ Azure Data Service Notebook currently provides a set of magic commands for users
 
 - Download and Install [python 3.6+](https://www.python.org/downloads/)
 - Install jupyter: `pip install jupyter` 
-- Install azure packages fully : 
- `pip install azure`
-- Or just install the key packages : 
- - `pip install adla`
- - `pip install azure-mgmt-resource`
- - `pip install azure-mgmt-datalake-analytics` 
- - `pip install azure-mgmt-datalake-store` 
- - `pip install azure-datalake-store` 
-- Copy the [adlmagic folder](/analytics_notebook/adlmagics) to local box. 
+- Install adlmagic extention : 
+ `pip install --no-cache-dir adlmagics`
+
 
 
 # Examples
-- [adlmagics_demo.ipynb](/analytics_notebook/adlmagics/00_adlmagics_demo.ipynb), demo file of Azure Data Lake job control functions.
+- [adlmagics_demo.ipynb](/adlmagics/00_adlmagics_demo.ipynb), demo file of Azure Data Lake job control functions.
 
 
+# Feedback
+- You can submit [bug report](https://github.com/Azure/Azure-Data-Service-Notebook/issues/new?template=bug_report.md) or [feature request](https://github.com/Azure/Azure-Data-Service-Notebook/issues/new?template=feature_request.md) directly in this repo. Our team will triage issues actively.
 
 # Contributing