Added readmes.

Signed-off-by: Mark Hale <mark.hale@physics.org>
Former-commit-id: 74c181edb4

contrib/blender/README.md

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+# Blender scripts
+# odm_photo
+Renders photos from ODM generated texture models.
+Currently can produce 360 panoramic photos and 360 3D panoramic (VR) photos.
+
+## Requirements
+* Blender
+* ExifTool (must be on your PATH)
+
+## Usage
+To generate a 360 panoramic photo:
+
+    blender -b photo_360.blend --python odm_photo.py -- <project-path>
+
+Output is `<project-path>/odm_photo/odm_photo_360.jpg`.
+
+To generate a 360 3D panoramic photo:
+
+    blender -b photo_vr.blend --python odm_photo.py -- <project-path>
+
+Output is `<project-path>/odm_photo/odm_photo_vr_L.jpg` and `<project-path>/odm_photo/odm_photo_vr_R.jpg`.
+
+**NB: argument order matters!**

contrib/grass/README.md

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+# GRASS scripts
+# odm_grass
+Generates DEM, contour and textured relief maps.
+
+## Requirements
+* GRASS
+* Environment variables:
+  * PYTHONHOME set to the location of Python
+  * PYTHONPATH set to the location of GRASS Python libs
+  * PATH includes GRASS bin and lib directories
+  * GISBASE set to the location of GRASS
+
+## Usage
+    python odm_grass.py <project-path>
+
+Output is `<project-path>/odm_georeferencing/odm_dem.tif`, `<project-path>/odm_georeferencing/odm_contour.shp` and `<project-path>/odm_orthophoto/odm_relief.tif`.