Add readme

Author: MadcapJake

README.md

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+# Rabble
+
+An implementation of a Forth-like language in Perl 6.
+
+## Usage
+
+```
+rabble [--debug|-d] <file>
+rabble [--expression|-e] [--debug|-d] <expr>
+```
+
+### Examples
+```Forth
+5 2 * . \\= 10
+```
+```Forth
+5 10 2 [ * ] dip .S \\= [50 2]>
+```
+```Forth
+7 6 [2 3 + + +] apply . \\= 18
+```
+
+## Plan
+
+To build a decently well-featured Forth in Perl 6, learn more about Perl 6 and Forth in the process, and explore ideas in all aspects.
+
+### Status
+
+Supports some basic words, anonymous blocks, and named functions.
+
+### Upcoming
+
+* Add more words
+* Implement a return stack
+* Tests
+* Debugger
+* REPL
+* Documentation