docs(README): add basic readme

README.md

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+# Purescript Stream
+
+> An ultra-fast reactive stream library for purescript
+
+## Let me have it
+```sh
+bower install --save purescript-stream
+```
+
+## Basic usage
+```purescript
+module Main where
+
+import Prelude
+import Control.Monad.Eff (Eff)
+import Control.Monad.Eff.Console (CONSOLE, logShow, log)
+import Control.Stream (STREAM, periodic, constant, scan, tapEvent, tapEnd, drain)
+import Data.Unit (Unit)
+
+main :: Eff (stream :: STREAM, console :: CONSOLE) Unit
+main = do
+  periodic 1000.0 -- Stream Unit
+    # constant 1 -- Stream Int
+    # scan (+) 0 -- Stream Int
+    # tapEvent logShow -- Perform side-effects on events
+    # tapEnd (log "done") -- Perform a side-effect on stream completion
+    # drain -- activate your stream
+```