Restore Initial Meaningful Test Infrastructure

This testing package was initially a part of flarum/core, but was
extracted during the 0.1.0-beta.16 release cycle. The extraction was
made through git's filter-branch tool to preserve some useful history in
the repository.

php-packages/testing/.editorconfig

@@ -0,0 +1,19 @@
+# EditorConfig helps developers define and maintain consistent
+# coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.{diff,md}]
+trim_trailing_whitespace = false
+
+[*.{php,xml}]
+indent_size = 4