added details to README.md

README.md

@@ -16,7 +16,30 @@ You should have received a copy of the GNU Affero General Public
 License along with this program.  If not, see
 <https://www.gnu.org/licenses/>.
 
-## Important Note
+## Executive Summary
 
-Ths program is not yet ready for release and should be considered
-subject to change at any time.
+This is a TUI abacus simulator.  It is a completely pointless program.  I
+made it solely for the sake of the absurdity.
+
+## Installation
+
+This program is written in [Haskell](https://haskell.org) using the
+Stack package manager.  The easiest way to install it is by first
+installing [GHCup](https://www.haskell.org/ghcup/), and then from
+within the project directory, run the command: `stack install`
+
+You should then be able to run it by simply typing `abacus` on the
+command line.  There are currently no command-line options.
+
+## Keys
+
+- C-c/q: Quit the program
+- up/k: move the rung selector up
+- down/j: move the rung selector down
+- PgUp/K/S-up: select the top rung
+- PgDn/J/S-down: select the bottom rung
+- left/h: slide a bead to the left
+- right/l: slide a bead to the right
+- Home/H/S-left: move the entire rung to the left
+- End/L/S-right: move the entire rung to the right
+- r: reset the abacus