docs: Add documentation for conda python

Exercise-1/RANSAC.py

@@ -3,6 +3,13 @@
 
 # Load Point Cloud file
 cloud = pcl.load_XYZRGB('tabletop.pcd')
+# For students using Python 2.7 with Anaconda,
+# PCL module can be installed from https://anaconda.org/ccordoba12/python-pcl
+# And the documentation as follows:
+# http://strawlab.github.io/python-pcl/
+# In that case, update the code above to:
+# cloud = pcl.PointCloud()
+# cloud.from_file('tabletop.pcd')
 
 
 # Voxel Grid filter