Add SKIP_PREFLIGHT_CHECK to .env

Update development instructions in README to add .env file.

Author: angelocordon

.env.example

@@ -0,0 +1 @@
+SKIP_PREFLIGHT_CHECK = true

.gitignore

@@ -4,6 +4,7 @@
 /node_modules
 /.pnp
 .pnp.js
+.env
 
 # testing
 /coverage

README.md

@@ -1,3 +1,25 @@
+## Setup
+
+Install dependencies:
+
+```bash
+npm i
+```
+
+Create a `.env` file and copy the keys and values from `.env.example`.
+
+Running the client server locally:
+
+```bash
+npm run start:client
+```
+
+Running tests:
+
+```bash
+npm run test
+```
+
 ## **Overview of Codebuddies**
 
 ### **What is CodeBuddies?**