Add README.md for simple explanation.

Change-Id: Id90846de24756eb8ebc79117ee282431fb61a36a

diff --git a/README.md b/README.md
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+# Launcher for .NET Application
+
+### Usage
+
+```
+dotnet-launcher [options...] [args...]
+```
+
+#### options
+
+* --version  
+   print version and exit.
+
+* --standalone [assembly path]  
+   Run assembly with the current user environment.
+
+----
+
+### Anatomy
+
+```
++----------------------------------------------------+
+| Tizen.Runtime.Mono.dll | Tizen.Runtime.Coreclr.dll |
++-----------+------------------------+---------------+
+|           | libmono.so |           | libcoreclr.so |
+|           +------------+           +---------------+
+| Mono Native Launcher   |   CoreClr Native Launcher |
++------------------------+---------------------------+
+|                  Dotnet launcher                   |
++----------------------------------------------------+
+
+```