update README

README.md

@@ -1,3 +1,45 @@
 # bitser
 
-Serializes and deserializes Lua values with LuaJIT.
+Serializes and deserializes Lua values with LuaJIT.
+
+    local bitser = require 'bitser'
+
+    bitser.register('someResource', someResource)
+    bitser.registerClass(SomeClass)
+
+    serializedData = bitser.dumps(someData)
+    someData = bitser.loads(serializedData)
+
+Pull requests, bug reports and other feedback welcome! :heart:
+
+## Why would I use this?
+
+Because it's fast. Because it produces tiny output. Because the name means "snappier"
+or "unfriendlier" in Dutch. Because it's safe to use with untrusted data.
+
+Because it's inspired by [binser](https://github.com/bakpakin/binser), which is great.
+
+## How do I use the benchmark thingy?
+
+Download zero or more of [binser.lua](https://github.com/bakpakin/binser/master/binser.lua),
+[ser.lua](https://github.com.com/gvx/Ser/master/ser.lua),
+[smallfolk.lua](https://github.com/gvx/Smallfolk/raw/master/smallfolk.lua) and
+[serpent.lua](https://github.com/pkulchenko/serpent/raw/master/src/serpent.lua), and run:
+
+    love .
+
+You do need [LÖVE](https://love2d.org/) for that.
+
+You can add more cases in the folder `cases/` (check out `_new.lua`), and add other
+serializers to the benchmark in `main.lua`. If you do either of those things, please
+send me a pull request!
+
+## You can register classes?
+
+Yes. At the moment, bitser supports MiddleClass, SECL, hump.class and Slither (and
+probably some other class libraries by accident).
+
+## What license is this under?
+
+None yet. It will be open source (probably MIT license) in the near future, but it
+needs more testing before it's production ready.