Update the readme explaining what this version does

README.md

@@ -1,3 +1,28 @@
+This fork is designed to fake googles VR180 camera metadata.
+It uses Spherical Video V2 metadata with the left and right crop set to 
+1073741823 which is 0x3FFFFFFF or 1/4 of 0xFFFFFFFF.
+
+Note this breaks 360 video's at the momenti as I've haven't coded any options I just wanted to get
+this out to the public.
+
+Note 2. Google may decide to break this as they do not seem to be interested in telling people how to do this.
+
+To use it you need a copy of python 2.7 (I've not tried it with 3.x)  and use the command line.
+It seems to work with top bottom and side by side layouts.
+
+Typical usage:
+
+python spatialmedia -i -s left-right -m equirectangular Test_180_3D.mp4 Test_STV2_180_3D.mp4
+or
+python spatialmedia -i -s top-bottom -m equirectangular Test_180_3D.mp4 Test_STV2_180_3D.mp4
+
+This will take the first file, inject the metadata and write the result out to the second file.
+
+This is basically kodabb/spatial-media sphericaltoolsv2 branch with two lines changed and
+merged into master so anyone wanting to use this doesn't have to play around with branches.
+
+THe original readme details below.
+
 # Spatial Media
 
 A collection of specifications and tools for 360° video and spatial audio, including: