Add install/update instructions, and TODOs

README.md

@@ -1,14 +1,23 @@
 diskii
 ======
+
 diskii is a commandline tool for working with Apple II disk images.
 
+[![Build Status](https://travis-ci.org/zellyn/diskii.svg?branch=master)](https://travis-ci.org/zellyn/diskii)
+
 Eventually, it aims to be a comprehensive disk image manipulation
 tool, but for now only the `applesoft decode` command works.
 
 It is pronounced so as to rhyme with "whiskey".
 
-[![Build Status](https://travis-ci.org/zellyn/diskii.svg?branch=master)](https://travis-ci.org/zellyn/diskii)
-
 Discussion/support is in
 [#apple2 on the retrocomputing Slack](https://retrocomputing.slack.com/messages/apple2/)
 (invites [here](https://retrocomputing.herokuapp.com)).
+
+### Installing/updating
+Assuming you have Go installed, run `go get -u github.com/zellyn/diskii`
+
+### Short-term TODOs/roadmap
+
+- [ ] Build per-platform binaries for Linux, MacOS, Windows
+- [ ] Implement CATALOG, deletion, and creation of files in DOS 3.3 images