Added README

README.md

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+# Apple //e emulator in go
+
+Ebiten based apple //e emulator written in go.
+
+## Features
+
+* MOS 6502 CPU
+* keyboard
+* 40 column text mode
+* low resolution color graphics
+* high resolution monochrome graphics
+* upper memory bank switching: $d000 page and ROM/RAM switching
+* main memory page1/page2 switching in text, lores and hires
+* speaker audio
+
+## Installation
+
+Install prerequisites with glide
+
+    glide up
+
+Build the executable
+
+    go build
+
+Download `apple2e.rom` from
+[a2go.applearchives.com](http://a2go.applearchives.com/roms/) and put it in the root directory.
+
+## Running it
+
+    go run apple2e.go
+    go run apple2e.go my_disk_image.dsk
+    go run apple2e.go -drive-head-click my_disk_image.dsk
+
+## Running the tests
+### Setting up the tests
+
+Some disk images are used for the tests
+
+* dos33.dsk from e.g. [mirrors.apple2.org.za](https://mirrors.apple2.org.za/ftp.apple.asimov.net/images/masters/DOS3.3SP.dsk)
+* prodos19.dsk from e.g. [mirrors.apple2.org.za](https://mirrors.apple2.org.za/ftp.apple.asimov.net/images/masters/prodos/ProDOS_1_9.dsk)
+
+### Running the tests
+
+    go test -v
+
+The CPU tests make use of [Klaus2m5's](https://github.com/Klaus2m5/6502_65C02_functional_tests)
+ excellent 6502 functional tests.
+
+## Known working images
+* DOS 3.3
+* Prodos 1.9
+* Lemonade stand
+* Montezuma's Revenge
+
+## Keyboard shortcuts
+
+* ctrl-alt-R reset
+* ctrl-alt-M mute
+* ctrl-alt-C capslock
+
+## Remaining work
+
+* 80 column card
+* 48k aux memory
+* double hires
+* paddles
+
+## Known issues
+
+1. On MacOS, the initial beep is sometimes split into two little beeps. This appears to be an ebiten issue.
+2. On MacOS, shutting down sometimes takes 30 seconds or so