update readme to reflect rudimentary install

readme.md

@@ -1,4 +1,16 @@
-Run run.pl
+Steps to get OpenDroneMap running:
+==================================
+
+Run install.sh to build.
+
+```install.sh```
+
+From a directory full of your images, run
+
+```Run run.pl```
+
+---
+
 
 From Meshlab 1.3.3: