added software page

Software.md

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+Software
+========
+
+The game currently needs to be installed from the source code, though we plan to have pre-built executables available in the future. It can be played on any operating system as long as Python and Pygame are installed.
+
+Requirements
+------------
+
+* [Python 3.7+](https://python.org)
+* [Pygame 2+](https://pygame.org)
+* [Git](https://git-scm.com/)
+* [Scrapeboard + PGFW code repository](https://open.shampoo.ooo/scrape/scrapeboard)
+
+Python
+------
+
+### Windows and OS X
+
+1. [Download the appropriate installer](https://www.python.org/downloads/) and follow the system-wide installation instructions.
+2. If prompted, choose to install pip (the Python package installer) alongside Python.
+
+### Linux
+
+Most likely Python 3 is already installed. If not, install it from the package manager. For example, on Raspberry Pi, run
+
+    sudo apt install python3
+
+Git
+---
+
+### Windows and OS X
+
+Download and install from <https://git-scm.com/downloads>.
+
+### Linux
+
+Install from the package manager
+
+    sudo apt install git
+
+Pygame
+------
+
+### Windows and OS X
+
+Pip should have been installed in the first step alongside Python. If not, see [PIP getting started](https://pip.pypa.io/en/stable/getting-started/). After pip is installed, call it from the command line to install Pygame. On Windows, this can be done with Powershell. On OS X, use Terminal.
+
+    python -m pip install pygame
+
+### Linux
+
+Install pip from the package manager
+
+    sudo apt install python3-pip
+
+Install pygame through pip
+
+    sudo pip install pygame
+
+### Scrapeboard and PGFW
+
+Use Git clone with the `--recursive` flag to download both Scrapeboard and the Pygame framework it uses from the command line (or PowerShell on Windows and Terminal on OS X). This can also be done from a Git GUI.
+
+    git clone --recursive https://open.shampoo.ooo/scrape/scrapeboard
+    cd scrapeboard/
+
+### Launch
+
+![Launch from command line](../../raw/branch/main/img/launch_from_command_line.png)
+
+It should be possible to run in keyboard mode and test input with key presses now. The `--no-serial` flag indicates to use keyboard mode because there is no Arduino attached.
+
+    ./OPEN-GAME --no-serial