Update README: Add OS support

Commands: echo, dup, pipe, grep. - Grep uses KMP.
bajdcc · Dec 15, 2016 · 28a6ad2 · 28a6ad2
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diff --git a/README.md b/README.md
@@ -20,6 +20,7 @@
 11. **Pipe**.
 12. **Multiple process**.
 13. Load file with Sync/Async.
+14. **Virtual machine**.
 
 #### What it generates
 
@@ -31,6 +32,16 @@
 - Virtual machine instructions.
 - Runtime environment.
 
+#### Virtual Machine OS
+
+An OS running on *jMiniLang* interpreter.
+
+Now has commands:
+- echo
+- dup
+- pipe
+- grep
+
 #### Manual
 
 [*Simplified Chinese Version*](https://raw.githubusercontent.com/bajdcc/jMiniLang/master/%E4%BD%BF%E7%94%A8%E8%AF%B4%E6%98%8E.pdf "Manual - Simplified Chinese")