Exclude unnecessary files from archives

.gitattributes

@@ -0,0 +1,11 @@
+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+/.editorconfig        export-ignore
+/.gitattributes       export-ignore
+/.github              export-ignore
+/.gitignore           export-ignore
+/box.json             export-ignore
+/phpcs.xml.dist       export-ignore
+/README.md            export-ignore
+/session-cookie.png   export-ignore