Include tinymce with NPM

One will need to run: "npm install" as from now
More info here: https://nodejs.dev/learn/an-introduction-to-the-npm-package-manager

package-lock.json

@@ -0,0 +1,11 @@
+{
+  "requires": true,
+  "lockfileVersion": 1,
+  "dependencies": {
+    "tinymce": {
+      "version": "5.10.0",
+      "resolved": "https://registry.npmjs.org/tinymce/-/tinymce-5.10.0.tgz",
+      "integrity": "sha512-SaqBK8GtTKYSsTfhKdN0+NrZRgmVWO+j3fvgzLjt0t/g0osNzRH5os8icm2Rv5HvaeTd4TpxetUuLE+R9yg/yg=="
+    }
+  }
+}