Init backend, frontend and DB schema

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = tab
+insert_final_newline = true
+tab_width = 4
+trim_trailing_whitespace = true
+
+[*.{yml,yaml}]
+indent_size = 2
+indent_style = space
+tab_width = 2