fix: add .gitattributes file and normalize all the line endings (#301)

* Add .gitattributes file

* Add LF normalization setting for .ts files

* Add LF normalization setting for .tsx files

* feat: add line endings rules for .js .json and .md

.gitattributes

@@ -0,0 +1,6 @@
+# Explicitly declare text files you want to always be normalized and converted to native line endings on checkout.
+*.ts text eol=lf
+*.tsx text eol=lf
+*.js text eol=lf
+*.json text eol=lf
+*.md text eol=lf