Extend ReadMe

Explain how to add a new location

README.md

@@ -1,2 +1,18 @@
 # Schnitzeljagd
-A map that with the right clues shows points on the map
+A map that with the right clues shows points on the map for some camps of the BWINF
+
+How to add a new location:
+1) copy the pfalz function and rename it
+2) change the data json
+  2.1) change the position
+  2.2) remove all existing locations
+  2.3) add as many locations as wished by 
+    copy and pasting the output of create_location(answer, lat, lon, message)
+    where "answer" is the clue the people should enter in the search field
+    copy it into the array (and dont forget commas at the end)
+3) add a Button
+3.1) Add ```<a onclick="test()" class="button">Potenziell andere?</a>``` in the index.html
+3.2) change name and called function
+4) in app.js add your camp name and function to the switch statement like this:
+  case "stingbert":
+      stingbert()