chore: update readme with build command and node versions

Author: stafyniaksacha

README.md

@@ -1,19 +1,20 @@
 # 👋 Krypton
+
 > Krypton is a free ICO / Crypto template built by [cssninjaStudio](https://cssninja.io).
 
 ![Screenshot](https://media.cssninja.io/products/krypton/product.png "Krypton")
 
 ## ✌️ preview
 
-Check out the live demo by clicking [here](https://cssninjastudio.github.io/krypton/). 
+Check out the live demo by clicking [here](https://cssninjastudio.github.io/krypton/).
 Krypton is built with [Bulma](https://bulma.io) and [Alpine JS](https://github.com/alpinejs/alpine).
 
 ## 👍 Features
 
-* Gulp 4 and nodejs 12.13.0 (minimum)
-* Bulma 0.9.1
-* ES6 support
-* Alpine JS
+- Gulp 4 and nodejs 12.20.0 to 16.0.0
+- Bulma 0.9.1
+- ES6 support
+- Alpine JS
 
 ## 👌 Usage
 
@@ -29,15 +30,26 @@ npm install
 npm run dev
 ```
 
+3. Build for production
+
+```sh
+# build the dist folder
+npm run build
+
+# preview the builded files
+npx http-server dist
+```
+
 ## 🍔 Issues
 
-If you've found an issue or a bug, you can report it in the issues section of this repository. Please try to follow these simple guidelines to report your issue:
+If you've found an issue or a bug, you can report it in the issues section of this repository.
+Please try to follow these simple guidelines to report your issue:
 
-* Issue definition
-* Expected behaviour
-* Actual behaviour
-* steps to reproduce
-* Already tried fixes (if relevant)
+- Issue definition
+- Expected behaviour
+- Actual behaviour
+- steps to reproduce
+- Already tried fixes (if relevant)
 
 ## 🎉 More