Add .gitattributes to exclude dev files for distribution

pH-7 · pH-7 · commit 1d07f71b8913 · 2021-09-26T20:26:46.000+09:30
And gives smaller download size as well 😃
diff --git a/.gitattributes b/.gitattributes
@@ -0,0 +1,4 @@
+/tests export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+phpunit.xml export-ignore
