[Docs] Update set-up procedure

@@ -32,30 +32,45 @@
 ## Getting Started (Installation)
 
 ### Set up
-```bash
+```sh
 git clone http://khuhub.khu.ac.kr/2021105636/Extended-Calendar.git
 npm install
 npm install -g nodemon
 npm install -g pm2
 ```
 
+Make `.env` in root directory.
+```sh
+# MySQL
+DB_HOST=
+DB_USER=
+DB_PASSWORD=
+DB_DATABASE=
+
+# Express
+SERVER_IP=
+
+# React
+REACT_APP_IP=
+REACT_APP_SERVER_IP=  # generally all the same
+```
+
+Import `schema.sql` in your DB.
+
 ### Run to debug
-> Terminal 1 ( Server )
->
-> ```
-> npm run server
-> ```
->
-> Terminal 2 ( React )
->
-> ```
-> npm start
-> ```
+Terminal 1 ( Server )
+```sh
+npm run server
+```
+Terminal 2 ( React )
+```sh
+npm start
+```
 
 port : 3000
 <br>
 ### Run to deploy
-```
+```sh
 npm run build
 npm run pm2
 ```