updating readmes for addpy and magic8ball samples.

Author: jeroenterheerdt

samples/features/sql-big-data-cluster/app-deploy/addpy/README.md

@@ -1,4 +1,4 @@
-# Running a Python script in SQL Server big data cluster
+# Running a basic Python script in SQL Server big data cluster
 
 ### Contents
 

samples/features/sql-big-data-cluster/app-deploy/magic8ball/README.md

@@ -0,0 +1,109 @@
+# Running a Magic 8-ball Python script in SQL Server big data cluster
+
+### Contents
+
+[About this sample](#about-this-sample)<br/>
+[Before you begin](#before-you-begin)<br/>
+[Run this sample](#run-this-sample)<br/>
+[Sample details](#sample-details)<br/>
+[Related links](#related-links)<br/>
+
+<a name=about-this-sample></a>
+
+## About this sample
+
+This is a sample [Python](https://www.python.org/) app, which runs a [Magic 8-Ball](https://en.wikipedia.org/wiki/Magic_8-Ball). This sample creates an app that adds requires a question as input and returns an answer to the question. The code for this sample is in [magic8ball.py](magic8ball.py) The inputs and outputs are shown below.
+
+### Inputs
+|Parameter|Description|
+|-|-|
+|`txt`|The input question on which you would like answered|
+
+### Outputs
+|Parameter|Description|
+|-|-|
+|`result`|The answer of the Magic 8-ball|
+
+
+<a name=before-you-begin></a>
+
+## Before you begin
+
+To run this sample, you need the following prerequisites.
+
+**Software prerequisites:**
+
+1. SQL Server big data cluster CTP 2.3 or later.
+2. `mssqlctl`. Refer to [installing mssqlctl](https://docs.microsoft.com/en-us/sql/big-data-cluster/deploy-install-mssqlctl?view=sqlallproducts-allversions) document on setting up the `mssqlctl` and connecting to a SQL Server 2019 big data cluster.
+
+<a name=run-this-sample></a>
+
+## Run this sample
+
+1. Clone or download this sample on your computer.
+2. Log in to the SQL Server big data cluster using the command below using the IP address of the `endpoint-service-proxy` in your cluster. If you are not familiar with `mssqltctl` you can refer to the [documentation](https://docs.microsoft.com/en-us/sql/big-data-cluster/big-data-cluster-create-apps?view=sqlallproducts-allversions) and then return to this sample.
+
+    ```bash
+    mssqlctl login -e https://<ip-address-of-endpoint-service-proxy>:30777 -u <user-name> -p <password>
+    ```
+3. Deploy the application by running the following command, specifying the folder where your `spec.yaml` and `magic8ball.py` files are located:
+    ```bash
+    mssqlctl app create --spec ./magic8ball
+    ```
+4. Check the deployment by running the following command:
+    ```bash
+    mssqlctl app list -n magic8ball -v [version]
+    ```
+    Once the app is listed as `Ready` you can continue to the next step.
+5. Test the app by running the following command:
+    ```bash
+    mssqlctl app run -n magic8ball -v [version] --input txt="Will it rain tomorrow?"
+    ```
+    You should get output like the example below. The answer to your question are returned as `result`.
+    ```json
+    {
+      "changedFiles": [],
+      "consoleOutput": "",
+      "errorMessage": "",
+      "outputFiles": {},
+      "outputParameters": {
+        "result": "You may rely on it"
+      },
+      "success": true
+    }
+    ```
+6. You can clean up the sample by running the following commands:
+    ```bash
+    # delete app
+    mssqlctl app delete --name magic8ball --version [version]
+    ```
+
+<a name=sample-details></a>
+
+## Sample details
+
+Please refer to [magic8ball.py](magic8ball.py) for the code for this sample.
+
+### Spec file
+Here is the spec file for this application. As you can see the sample uses the `Python` runtime and calls the `magic8ball` method in the `magic8ball.py` file, accepting a `str` input called `txt` (the question that you ask the Magic 8-ball) and returning a `str` output named `result`.
+
+```yaml
+name: magic8ball
+version: v2
+runtime: Python
+src: ./magic8ball.py
+entrypoint: magic8ball
+replicas: 1
+poolsize: 1
+inputs:
+  txt: str
+output:
+  result: str
+```
+
+<a name=related-links></a>
+
+## Related Links
+For more information, see these articles:
+
+[How to deploy and app on SQL Server 2019 big data cluster (preview)](https://docs.microsoft.com/en-us/sql/big-data-cluster/big-data-cluster-create-apps?view=sqlallproducts-allversions)