Add Samples folder to .gitignore (#499)

Update .gitignore

Author: keveleigh

UnityProjects/.gitignore

@@ -84,6 +84,7 @@ crashlytics-build.properties
 # Project Specific List
 */[Aa]ssets/[Bb]uild[Rr]eports*
 */[Aa]ssets/[Oo]culus*
+*/[Aa]ssets/[Ss]amples*
 */[Aa]ssets/TextMesh Pro*
 *.pfx
 *.pfx.meta