Added markdown-it standard npm package.

npm/packs/markdown-it/abp.resourcemapping.js

@@ -0,0 +1,8 @@
+module.exports = {
+    imports: [
+        "../core/abp.resourcemapping.js"
+    ],
+    mappings: {
+        "@node_modules/markdown-it/dist/markdown-it.min.js": "@libs/markdown-it/"
+    }
+}

npm/packs/markdown-it/package.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.3.1",
+  "name": "@abp/markdown-it",
+  "publishConfig": {
+    "access": "public"
+  },
+  "dependencies": {
+    "@abp/core": "^0.3.1",
+    "markdown-it": "^8.4.1"
+  }
+}