add codemirror & simplemde plugin files

package.json

@@ -84,6 +84,7 @@
     "bs-custom-file-input": "^1.3.4",
     "bs-stepper": "^1.7.0",
     "chart.js": "^2.9.3",
+    "codemirror": "^5.56.0",
     "datatables.net": "^1.10.21",
     "datatables.net-autofill-bs4": "^2.3.5",
     "datatables.net-bs4": "^1.10.21",
@@ -122,6 +123,7 @@
     "popper.js": "^1.16.1",
     "raphael": "^2.3.0",
     "select2": "^4.0.13",
+    "simplemde": "^1.11.2",
     "sparklines": "^1.2.0",
     "summernote": "^0.8.18",
     "sweetalert2": "^9.15.2",