Update installation instructions

README.md

@@ -54,8 +54,25 @@ If you do want to use my fork, feel free to create an Issue or
 email me if you need help - that may spur me to clean things up a bit.
 
 ## Installation
+
+### From a git clone
+
+```
+npm install
+npm run build:bundles
+```
+
+Copy the file `dist/bundle/esm/golden-layout.min.js` (if using EcmaScript modules, as recommended) or `dist/bundle/umd/golden-layout.min.js` (if using UMD modules) to a folder (for example `lib`) inside your application.
+Import it from there, for example with:
+```
+import { GoldenLayout } from '../lib/golden-layout/golden-layout.min.js'
+```
+Also recursively copy the contents of `dist/css` to where you application can read them,
+
+### Using npm
+
 The library can be installed into an application package with the npm command:\
-`npm i golden-layout`
+`npm i golden-layout`  However, this may get you a very old version.
 
 ## More information