add: toc to readme

README.md

-# PROG2900
+# IceMap PROG2900
+This software was developed at NTNU as part of a Bachelor thesis for the municipality of Gjøvik.
+
+## Table of contents
+* [Server](#server)
+  * [Endpoints](#endpoints)
+    * [Update map](#update-map)
+    * [Get relation](#get-relation)
+    * [Get lake names](#get-lake-names)
+    * [Update measurements](#update-measurements)
+    * [Add new lake](#add-new-lake)
+    * [Add test data](#add-test-data)
+    * [New lidar data](#new-lidar-data)
+  * [Database](#database)
+  * [Server dependencies](#server-dependencies)
+  * [Known bugs](#known-bugs)
+* [Application](#application)
+  * [Application dependencies](#application-dependencies)
+* [Developers](#devleopers)
 
 # Server
 The server currently only accepts HTTPS requests, not HTTP.