Merge pull request #19 from sbmaxx/readme

Added readme

README.md

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+## pointer-gestures
+Library which gesture events in a mobile-performant way.
+
+_In the next release, polymer-gestures will replace (the now deprecated) [PointerGestures](https://github.com/Polymer/PointerGestures), and [PointerEvents](https://github.com/Polymer/PointerEvents) will be removed from the default build._
+
+Supported events:
+* down
+* up
+    * Same target as down, provides the element under the pointer with the relatedTarget property
+* trackstart
+* track
+    * Same target as down
+* trackend
+    * Same target as down, provides the element under the pointer with the relatedTarget property
+* tap
+    * Targets the nearest common ancestor of down and up.relatedTarget
+    * Can be prevented by calling any gesture event's preventTap function
+
+Not yet implemented:
+* flick
+* hold
+* holdpulse
+* release
+* pinchstart
+* pinch
+* pinchend
+
+More info — https://groups.google.com/forum/#!topic/polymer-dev/ba4aDyOozm8
+
+## How to build
+
+```bash
+mkdir gestures
+cd gestures
+git clone [email protected]:Polymer/tools.git
+git clone [email protected]:Polymer/polymer-gestures.git
+cd polymer-gestures
+npm install
+grunt
+```
+
+## Hot to run
+```bash
+cd gestures
+python -m SimpleHTTPServer
+open http://localhost:8000/polymer-gestures/samples/simple/
+```
+More info — http://www.polymer-project.org/resources/tooling-strategy.html