Add goals to the README.

Author: progval

README.md

@@ -10,10 +10,23 @@ A Python virtual machine, written in Rust.
 * useable as a library
 * a fine-grained sandbox
 
+## Goals
+
+* Compatible with CPython's bytecode from 3.4 to 3.6, in order to take advantage of [FAT Python](https://faster-cpython.readthedocs.org/fat_python.html)
+* Support CPython's implementation of the standard library
+* No crash, even when messing with code objects
+* Bytecode optimizations at runtime
+* Less bounded by the GIL than CPython
+
+## Dependencies
+
+* CPython 3.4 (used as a parser and bytecode compiler). Versions newer than 3.4 should work, but their support is not tested.
+* [Rust](https://www.rust-lang.org/downloads.html)
+* [Cargo](https://crates.io/install)
+
 ## Try it
 
-1. Install Python 3.4 (used as a parser and bytecode compiler), git, [Rust](https://www.rust-lang.org/downloads.html) and [Cargo](https://crates.io/install)
-2. `git clone https://github.com/ProgVal/pythonvm-rust.git`
-3. `cd pythonvm-rust`
-4. `python3 -m compileall -b pythonlib examples`
-5. `cargo run pythonlib/ examples/helloworld.pyc`
+1. `git clone https://github.com/ProgVal/pythonvm-rust.git`
+2. `cd pythonvm-rust`
+3. `python3 -m compileall -b pythonlib examples`
+4. `cargo run pythonlib/ examples/helloworld.pyc`