Update README.md

README.md

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 # simple_minesweeper
-A 0 dependency, prompt based, simple minesweeper clone for the terminal
+A 0 dependency, prompt based, simple minesweeper clone for the terminal.
+
+## Installation
+First ensure you have Rust installed (best to use rustup).
+
+Then:
+```
+git clone https://github.com/auronandace/simple_minesweeper
+cd simple_minesweeper
+cargo install --path .
+```
+
+## Playing
+Launch `simple_minesweeper` in a terminal and follow the on-screen prompts. No arguments are required when launching the program.
+
+First you set the width and the height of the minefield. Minimum is 2 and maximum is 26. Each row and column is marked by a letter of the alphabet. Rows are lowercase letters and columns are uppercase letters.
+
+To open a square you type the lowercase letter o followed by a space and the co-ordinate of the square (example: `o aA`). To flag a square you type a lowercase f followed by a space and the co-ordinate of the square (example: `f bB`). To quit you simply type a lowercase q.
+
+When all mines have been flagged and all remaining squares opened you have won the game.