Add travis badges

Author: ethanhann

README.md

@@ -2,13 +2,20 @@
 
 [Project Site](http://inengine.net/)
 
-<a href="https://www.nuget.org/packages/IntegrationEngine/">
-    <img src="https://img.shields.io/nuget/dt/IntegrationEngine.svg?style=flat-square">
-</a>
-<a href="https://ci.appveyor.com/project/ethanhann/inengine-net/branch/master">
-    <img src="https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=master&svg=true&passingText=master%20-%20OK">
-</a>
-<a href="https://ci.appveyor.com/project/ethanhann/inengine-net/branch/develop">
-    <img src="https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=develop&svg=true&passingText=develop%20-%20OK">
-</a>
+
+[![Package Downloads](https://img.shields.io/nuget/dt/IntegrationEngine.svg?style=flat-square)](https://www.nuget.org/packages/IntegrationEngine/)
+
+| Branch  | Windows                                               | Linux                                              |
+| ------- | ----------------------------------------------------- | -------------------------------------------------- |
+| master  | [![master Windows][masterWindows]](masterAppVeyor)    | [![master Linux][masterLinux]](travis)             |
+| develop | [![develop Windows][developWindows]](developAppVeyor) | [![develop Windows][developLinux]](travis)         |
+
+[masterAppVeyor]: https://ci.appveyor.com/project/ethanhann/inengine-net/branch/master
+[developAppVeyor]: https://ci.appveyor.com/project/ethanhann/inengine-net/branch/develop
+[travis]: https://travis-ci.org/ethanhann/InEngine.NET
+[masterWindows]: https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=master&svg=true&passingText=master%20-%20OK
+[developWindows]: https://ci.appveyor.com/api/projects/status/github/ethanhann/inengine.net?branch=develop&svg=true&passingText=develop%20-%20OK
+[masterLinux]: https://travis-ci.org/ethanhann/InEngine.NET.svg?branch=master?style=flat-square
+[developLinux]: https://travis-ci.org/ethanhann/InEngine.NET.svg?branch=develop?style=flat-square
+