Add missing env description to readme

README.md

@@ -4,7 +4,7 @@ A Spring Boot overlay server for Twitch broadcasters and their channel admins. B
 
 ## Running
 
-Define the following environment variables:
+Define the following required environment variables:
 
 | Variable | Description | Example Value |
 |----------|-------------|---------------|
@@ -14,3 +14,11 @@ Define the following environment variables:
 | IMGFLOAT_INITIAL_TWITCH_USERNAME_SYSADMIN | Twitch username of the initial sysadmin user | example_broadcaster |
 | SPRING_SERVLET_MULTIPART_MAX_FILE_SIZE | Maximum upload file size | 10MB |
 | SPRING_SERVLET_MULTIPART_MAX_REQUEST_SIZE | Maximum upload request size | 10MB |
+| TWITCH_CLIENT_ID | Oauth2 client id | i1bjnh4whieht5kzn307nvu3rn5pqi |
+| TWITCH_CLIENT_SECRET Oauth2 client secret | vpkn8cp7ona65l121j6q78l9gkmed3 |
+
+Optional:
+
+| Variable | Description | Example Value |
+|----------|-------------|---------------|
+| TWITCH_REDIRECT_URI | Override default redirect URI | http://localhost:8080/login/oauth2/code/twitch |