Yang Linter in bash

An init version of a yang linter using bash.

IssueID: OAM-101
Change-Id: I91dcfe9ca84aff5222cf841a54fb25fd529a561c
Signed-off-by: demx8as6 <martin.skorupski@highstreet-technologies.com>
diff --git a/.gitignore b/.gitignore
index e1e63c6..9455bca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,3 +32,5 @@
 node_modules/
 .fbExcludeFilterFile
 *.md.html
+_3GPP
+