chore: add .gitattributes to extensions to export-ignore files. (#3513)

Signed-off-by: Sami Mazouz <[email protected]>

Author: SychO9

.gitattributes

@@ -0,0 +1,20 @@
+**/.gitattributes export-ignore
+**/.gitignore export-ignore
+**/.gitmodules export-ignore
+**/.github export-ignore
+**/.travis export-ignore
+**/.travis.yml export-ignore
+**/.editorconfig export-ignore
+**/.styleci.yml export-ignore
+
+**/phpunit.xml export-ignore
+**/tests export-ignore
+
+**/js/dist/**/* -diff
+**/js/dist/**/* linguist-generated
+**/js/dist-typings/**/* -diff
+**/js/dist-typings/**/* linguist-generated
+**/js/yarn.lock -diff
+**/js/package-lock.json -diff
+
+* text=auto eol=lf