task(pom.xml): add package.json.

Generated by the following commands:
$ cd src/main/frontend
$ ./node/node node/node_modules/npm/bin/npm-cli.js init

Addressed to #1060

No functional changes.

Author: php-coder

src/main/frontend/package.json

@@ -0,0 +1,24 @@
+{
+  "name": "mystamps-frontend",
+  "version": "0.0.4",
+  "description": "Frontend of https://my-stamps.ru",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/php-coder/mystamps.git"
+  },
+  "keywords": [
+    "mystamps"
+  ],
+  "author": "Slava Semushin",
+  "license": "GPL-2.0",
+  "bugs": {
+    "url": "https://github.com/php-coder/mystamps/issues"
+  },
+  "homepage": "https://github.com/php-coder/mystamps#readme"
+}