Update and rename sphere_healpy.py to sphere_healpy.md

Author: PatilSwarali

sphere_healpy.py renamed to sphere_healpy.md

@@ -1,3 +1,10 @@
+# Plot a sphere and pixel centers on it using Healpix package
+
+*tags:* python, healpix, healpy
+
+### Snippet 
+```
+
 from mayavi import mlab
 import numpy as np
 import healpy as hp
@@ -25,3 +32,4 @@
 
 
 mlab.show()
+'''