add environment variables

README.md

@@ -8,20 +8,20 @@
 
 ## Install Dependencies
 
-
 ### Server
+
 ```bash
 cd ./server && npm i -D
 ```
 
 ### Client
+
 ```bash
 cd ./client && npm i -D
 ```
 
 ## Run
 
-
 ### Server (with live reload)
 
 ```bash
@@ -44,4 +44,17 @@ cd ./client && npm start
 
 ```bash
 cd ./client && npm run dev
-```
+```
+
+## Environment Variables
+
+The following is the schema for the environment variables used in the server.
+
+| Variable Name | Description |
+| --- | --- |
+| DB_HOST | The hostname of the database server. |
+| DB_USER | The username to authenticate with the database. |
+| DB_PASS | The password to authenticate with the database. |
+| DB_PORT | The port on which the database server is listening. |
+| DB_NAME | The name of the database to connect to. |
+| JWT_SECRET | The secret key used to sign JSON Web Tokens for authentication. |