TASK: Provide basic .editorconfig

Resolves #2

.editorconfig

+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+charset = utf-8
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+# YAML
+[{*.yaml,*.yml}]
+indent_style = space
+indent_size = 2
+
+# composer.json
+[composer.json]
+indent_style = space
+indent_size = 2