Create README.md

Author: starpit

README.md

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+# OpenWhisk Shell
+
+Welcome to the OpenWhisk shell. To get started, download the [one of the binary releases](#images).
+
+## Exploring the Shell
+
+For a comparative study, of `wsk` versus this new cli-gui shell, check out these [demos]( https://openwhisk.ng.bluemix.net/api/v1/web/nickm_wskng_demos/public/index.html).
+
+## <a name="images">Installation using a pre-built binary
+
+  - macOS: [OpenWhisk.dmg](https://ibm.box.com/shared/static/men880t5v21usgfw3895u4gcdaiu6kmr.dmg)
+  - Windows [OpenWhisk-win32-x64.zip](https://ibm.box.com/shared/static/obyr7i38knwciwdc1vbj7811m6ulm25f.zip)
+  - Linux [OpenWhisk-linux-x64.zip](https://ibm.box.com/shared/static/pqg9f2c9mivpkobu3danzdy4crahpp1n.zip)
+
+Currently, these images are not signed, so you will get a security warning when launching the app. To allow access to the app on macOS, either command-click (right-click) and Open, or double-click the app, and then open the Security & Privacy preferences pane, and click "Open anyway".
+
+<img width="150" alt="Granting permission on macOS" src="https://user-images.githubusercontent.com/4741620/28502723-9b8c550e-6fc6-11e7-9ad1-212e7c75f98e.png">