added API Reference

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+*.lck

Docs/REST-API/API Reference.md

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+# API Reference
+
+The vpr Api ist created around REST. Our Api has several different endpoint, that are URL based and accept standard form-encoded request bodies.
+It returns JSON-encoded responses and uses standard HTTP response codes.
+
+---
+
+## The Endpoints at "/vpr/"
+GET:
+- /all-users
+  
+POST:
+- /all-events
+- /add-user
+- /add-event
+- /del-event
+
+---
+
+## Status-codes dan HTTP-responses
+
+| STATUS | meaning |
+| --- | --- |
+| 200 | OK. The Request was successful |
+| 400 | Bad request. Check if you send all parameter |
+| 404 | endpoint not found. The Url might contain a spelling mistake |
+| 405 | Request-Method not allowed. Check if the endpoint requires an GET or POST request |
+| 500 | Internal Server error. The request failed due to an exception at the server, the Request-parameter might be in a wrong format, or the database might be unreachable |
+
+---
+
+## /all-users
+
+Request (GET):
+
+    curl localhost:8080/vpr/all-users
+
+Response:
+
+    [
+        [
+            userId: int, 
+            forename: string, 
+            name: string 
+        ]
+    ]
+
+---
+
+## /all-events
+
+Request (POST):
+
+    curl localhost:8080/vpr/all-events -X POST -d "userId=<int>"
+
+Response:
+
+    [
+        [
+            eventId: int, 
+            name: string, 
+            start: string, 
+            priority: int,
+            isFullDay: boolean,
+            date: string,
+            userId: int, 
+            forename: string, 
+            name: string 
+            
+        ]
+    ]
+
+---
+
+## /add-user
+
+Request (POST):
+
+    curl localhost:8080/vpr/add-user -X POST -d "name=<string>&forename=<string>&password=<string>&isAdmin=<boolean>"
+
+Response:
+
+    status 200 if request is ok
+    
+    And String "Saved"
+
+---
+
+## /add-event
+
+Request (POST):
+
+    curl localhost:8080/vpr/add-event -X POST -d "userId=<String>&date=<String>&name=<String>&start=<String>&end=<String>&prority=<int>&isFullDay=<boolean>&isPrivate=<boolean>"
+
+Response:
+
+    status 200 if request is ok
+    
+    And String "Saved"
+
+---
+
+## /del-event
+
+Request (POST):
+
+    curl localhost:8080/vpr/del-event -X POST -d "eventId=<int>"
+
+Response:
+
+    status 200 if request is ok
+
+    And String "Deleted"