Make github main language as C# (#153)

* Listing Less and Css file as C#

* let razor files count as c#

Co-authored-by: James Yeung <shunjiey@hotmail.com>

.gitattributes

@@ -61,3 +61,5 @@
 #*.PDF   diff=astextplain
 #*.rtf   diff=astextplain
 #*.RTF   diff=astextplain
+
+*.razor linguist-language=C#