Added readme information under /docs about building and prerequisites (#126)

Co-authored-by: Gina Maini <gina.maini@cms.hhs.gov>

docs/README.md

@@ -1,3 +1,37 @@
+# Installation Prerequisites
+
+1. [Install the latest docker](https://docs.docker.com/get-docker/) and you may want to install [docker desktop - latest](https://docs.docker.com/desktop/)
+2. [Install python 3.9.5 (latest) and](https://www.python.org/downloads/) [configure your environment](https://docs.python.org/3/tutorial/venv.html) to get data-platform source environment ready.
+3. Install Visual Studio Code (python packages & typescript) <TODO: add .vscode>
+4. [Installing nvm](https://github.com/nvm-sh/nvm#installing-and-updating) and then do:
+```sh
+nvm install 14.17.0
+
+nvm use 14.17.0
+```
+and now when you do:
+```sh
+node -v
+```
+you should see:
+```sh
+v14.17.0
+```
+6. Install [node.js](https://nodejs.org/en/download/) and install all dependencies by `cd`ing into the `/client` directory and running:
+
+```sh
+npm install
+```
+* Note: `npm install` will check the `package-lock.json` fill and restore all transitive dependencies that are in the lock.
+
+# Build
+
+<TODO: .vscode/task.json file with build commands for each backend>
+
+# PR Process & Git Flow
+
+[See Contributing.md](../CONTRIBUTING.md)
+
 # Documentation
 
 Here you'll find all Justice40 project documentation.