restore composer.json, add mysqli extension

public/vendor/picker/example/browserify/README.md

@@ -0,0 +1,11 @@
+# Browserify example
+
+Two steps need to be done for this to work
+
+In the project root
+
+    npm install
+
+In this folder
+
+    ../../node_modules/.bin/browserify main.js -o bundle.js