Implemented: Add root .editorconfig and settings for CMake files

.editorconfig

@@ -0,0 +1,10 @@
+# See <http://EditorConfig.org> for details
+
+root = true
+
+[CMakeLists.txt,*.cmake{,.in}]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_size = 2
+indent_style = space