Enhancement: Add .editorconfig

Author: localheinz

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.yml]
+indent_size = 2

.gitattributes

@@ -1,5 +1,6 @@
 /docs               export-ignore
 /tests              export-ignore
+.editorconfig       export-ignore
 .gitignore          export-ignore
 .travis.yml         export-ignore
 phpunit.dist.xml    export-ignore