Add bitcoinjs-lib to libs directory

libs/bitcoinjs-lib/bitcoinjs-lib.js

@@ -0,0 +1,5 @@
+let bitcoin = require('bitcoinjs-lib')
+
+module.exports = {
+  bitcoin
+}

libs/bitcoinjs-lib/package.json

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+{
+  "name": "bitcoinjs-lib",
+  "version": "3.3.2",
+  "scripts": {
+    "build": "browserify bitcoinjs-lib.js --standalone bitcoinjs > /tmp/bitcoinjs-lib.js"
+  },
+  "dependencies": {
+    "bitcoinjs-lib": "3.3.2"
+  },
+  "devDependencies": {
+    "browserify": "^16.2.3",
+    "uglify-es": "^3.3.9"
+  }
+}

libs/bitcoinjs-lib/readme.md

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+Build (will create a bundle and copy it to /tmp/bitcoinjs-lib.js):
+
+    npm install
+    npm run build