Create README.md

Author: xupefei

README.md

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+![QuickLook icon](https://user-images.githubusercontent.com/1687847/29485863-8cd61b7c-84e2-11e7-97d5-eacc2ba10d28.png)
+
+# QuickLook.Plugin.HelloWorld
+
+This plugin illustrates the development process of [QuickLook](https://github.com/QL-Win/QuickLook).
+
+## Try out
+
+1. Go to [Release page](https://github.com/QL-Win/QuickLook.Plugin.HelloWorld/releases) and download the latest version.
+2. Make sure that you have QuickLook running in the background. Go to your Download folder, and press <key>Spacebar</key> on the downloaded `.qlplugin` file.
+3. Click the “Install” button in the popup window.
+4. Restart QuickLook.
+5. Create a file, change its extension to `.zzz`.
+6. Select the file and press <key>Spacebar</key>.
+
+## Development
+
+ 1. Clone this project. Do not forget to update submodules.
+ 2. Build project with `Release` profile.
+ 3. Run `Scripts\pack-zip.ps1`.
+ 4. You should find a file named `QuickLook.Plugin.HelloWorld.qlplugin` in the project directory.
+
+## License
+
+MIT License.