Added documentation section to README

Former-commit-id: 68cb3aaf45

README.md

@@ -51,6 +51,13 @@ Long term, the aim is for the toolchain to also be able to optionally push to a
 
 ---
 
+
+Documentation:
+==============
+
+For documentation, please take a look at our [wiki](https://github.com/OpenDroneMap/OpenDroneMap/wiki).
+
+
 Troubleshooting:
 ================