Add instructions and endpoint documentation to README.md

README.md

@@ -1 +1,24 @@
 # Bullet Hell Jam 2022 scoreboard server
+
+## Run the server
+Edit .env (and docker-compose ports if necessary)
+and run
+```
+$ docker-compose up
+```
+
+## Initialize database
+Connect to DB using specified root credentials  
+Execute schema.sql to create tables and fields
+
+Create new user `scoreboard` with the specified password and grant permissions `select, insert` on `scoreboard` table
+
+## Endpoints 
+- /scores 
+    - GET: returns all scores in descending order (LIMIT 10)
+    - POST: inserts a new score (Params: username, score, additional_data)
+
+The endpoint takes content of type `application/x-www-form-urlencoded`  
+ - `username` String of length <= 5  
+ - `score` Integer  
+ - `additional_data` String, optional (inteneded for potential metadata)