jquery.observable docs started

Author: dfilatov

src/jquery.observable/readme.md

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+jQuery observable plugin
+========================
+Plugin provides very fast (doubly linked list based) implementation of observable pattern.
+
+Usage
+-----
+```javascript
+var observable = new $.observable();
+
+// Subscribing on event
+observable.on(event, [data], callback, [context]);
+
+// Subscribing on some events
+observable.on(
+    {
+        event1 : callback1,
+        event2 : callback2,
+        ...
+        eventN : callbackN
+    },
+    [context]);
+
+// Subscribing only on first time the event occurs. Callback is unsubscribed after that.
+observable.once(event, [data], callback, [context]);