Update readme with basic description and installation info

README.md

@@ -1,21 +1,18 @@
 # Tetris
 
-**TODO: Add description**
+## Description
+Basic Tetris game written in Elixir using Phoenix Liveview - from groxio tutorial
 
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `tetris` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do
   [
-    {:tetris, "~> 0.1.0"}
+    {:tetris, git: "https://gitea1.intx.com.au/jn/tetris.git", tag: "0.1.0"}
   ]
 end
 ```
 
 Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at <https://hexdocs.pm/tetris>.