Added .clang-format and .editorconfig

.clang-format

@@ -0,0 +1,14 @@
+---
+BasedOnStyle: LLVM
+IndentWidth: 4
+TabWidth: 4
+UseTab: ForIndentation
+---
+Language: Cpp
+Standard: Cpp11
+AccessModifierOffset: -4
+ColumnLimit: 100
+---
+Language: JavaScript
+ColumnLimit: 80
+...

.editorconfig

@@ -0,0 +1,11 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 4
+