add README

Author: bencoder

README.md

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+# 6502 Emulator
+
+Yet another 6502 emulator, in typescript.
+
+## How to run
+
+The easiest way is with ts-node
+
+```
+> npm install
+> npm install -g ts-node
+> ts-node index.ts roms/wozmon
+```
+
+## Roms
+
+2 Roms are included in `roms/` directory, with their code in `programs/`.
+
+- inc-chars
+ - echos all characters typed to the screen, incremented by 1, quickly coded during emulator development to test it
+- wozmon
+ - The classic software by Woz, adapted for this emulator
+
+## Memory map
+
+The memory map is currently pretty simple:
+
+| Addresses | Interface | Notes |
+| --------- | --------- | --------------------------------------------------------------------------------------------------------------------------- |
+| 0-6FFF | Ram | |
+| 7000-7FFF | IO | Unrealistically implemented, but read from any address to read from input buffer, write to any address to output to console |
+| 8000-FFFF | Rom | loaded from the command line argument |