add postinstall message

package.json

@@ -4,7 +4,8 @@
   "description": "Razzle plugin to add webpack-bundle-analyzer",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "postinstall": "node postinstall.js"
   },
   "repository": {
     "type": "git",
@@ -23,6 +24,7 @@
   },
   "homepage": "https://github.com/nimacsoft/razzle-plugin-bundle-analyzer#readme",
   "dependencies": {
+    "print-message": "^3.0.1",
     "webpack": "~4.0.0",
     "webpack-bundle-analyzer": ">=3.6.0"
   }

postinstall.js

@@ -0,0 +1,25 @@
+const printMessage = require("print-message");
+
+printMessage(
+  [
+    "To enable Razzle Bundle Analyzer create `razzle.config.js` file in root of your project",
+    "and put this in it:",
+    "",
+    "module.exports = {",
+    "  plugins: ['bundle-analyzer']",
+    "};",
+    "",
+    "then, add this script to your scripts in package.json:",
+    "",
+    "\"analyze\": \"BUNDLE_ANALYZE=true razzle build\"",
+    "",
+    "finnaly run analyze command with npm or yarn:",
+    "`npm run analyze` or `yarn analyze`"
+  ],
+  {
+    border: true,
+    borderColor: "yellow",
+    marginTop: 3,
+    marginBottom: 3
+  }
+);