Update README.md

Author: chaowlert

README.md

@@ -1,2 +1,28 @@
+![Icon](http://www.fancyicons.com/free-icons/112/must-have/png/128/pause_128.png)
+
 # ExpressionDebugger
-Step through debugging and generate readable script from linq expressions
+Step into debugging and generate readable script from linq expressions
+
+### Get it
+```
+PM> Install-Package Mapster
+```
+
+### Get readable script
+You can compile expression into readable script by `ToScript` extension method
+```CSharp
+var script = lambda.ToScript();
+```
+
+### Compile with debug info
+`CompileWithDebugInfo` extension method will allow step-into debugging.
+```CSharp
+var func = lambda.CompileWithDebugInfo();
+func(); //<-- you can step-into this function!!
+```
+
+In order to step-into debugging, make sure you turn off just my code feature.
+![turn off just my code](https://cloud.githubusercontent.com/assets/5763993/23740682/47608676-04d7-11e7-842d-77c18a459515.png)
+
+#### Net Core support
+Currently, step-info debugging is working only in .NET 4.x. .NET Core doesn't support this feature yet.