Add .editorconfig and .yamllint files

Author: phansys

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+end_of_line = lf
+indent_style = space
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{twig,php}]
+indent_size = 4
+
+[.yamllint]
+indent_size = 4
+
+[composer.json]
+indent_size = 4
+
+[Makefile]
+indent_style = tab

.yamllint

@@ -0,0 +1,11 @@
+# DO NOT EDIT THIS FILE!
+#
+# It's auto-generated by sonata-project/dev-kit package.
+
+extends: default
+
+rules:
+    document-start: disable
+    line-length:
+        max: 120
+        level: warning