Update README.md

README.md

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 # Pharo VM
 
-This is the main branch of the Pharo VM.
-
-For more details about the whole Pharo VM project refer to our [wiki](../../wiki). 
-
+This repository holds the code of the Pharo Virtual Machine.
 This implementation started as a fork of [OpenSmalltalk-vm](https://github.com/OpenSmalltalk/opensmalltalk-vm).
-
 The current project could not have been possible with all their previous work.
 
+The current implementation presents the following core features:
+- an indirect threaded bytecode compiler using GNU extensions
+- a generational scavenger garbage collector: semi-space + nursery for the young generation, a mark-compact collecting for the old generation
+- a space for permanent objects that need not to be scanned by the GC
+- a baseline JIT compiler that
+  - translates primitive operations using IR templates
+  - translates bytecode methods using a simple abstract interpretation approach to reduce memory pressure (less loads/stores)
+- FFI through the well-known [libFFI](https://github.com/libffi/libffi), and support for non-blocking FFI using worker threads
+
+For more details about the whole Pharo VM project refer to our [wiki](../../wiki). 
+
 # Table of Contents
 
 - Building the Virtual Machine