Add .gitattributes file with export ignore rules

.gitattributes

@@ -0,0 +1,25 @@
+# Exclude these files from release archives.
+# This will also make them unavailable when using Composer with `--prefer-dist`.
+# If you develop this package using Composer, use `--prefer-source`.
+# https://blog.madewithlove.be/post/gitattributes/
+
+bin              export-ignore
+stubs            export-ignore
+tests            export-ignore
+.gitattributes   export-ignore
+.gitignore       export-ignore
+composer.lock    export-ignore
+phpcs.xml.dist   export-ignore
+phpunit.xml.dist export-ignore
+psalm.xml.dist   export-ignore
+
+# Auto detect text files and perform LF normalization
+# https://pablorsk.medium.com/be-a-git-ninja-the-gitattributes-file-e58c07c9e915
+
+* text=auto
+
+# The above will handle all files NOT found below
+
+*.md  text
+*.php text
+*.inc text