add readme

README.md

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+# Minitch
+Minitch is a very tiny cli itch.io client to install and update games.
+
+## Installation
+Clone this repository and install requirements
+
+### via pip
+```bash
+pip install --user -r requirements.txt
+```
+
+### via pipenv
+```bash
+pipenv install
+```
+
+## Usage
+If you have installed via pipenv, you have to do pipenv run before all commands (or use pipenv shell)
+
+### Configure your API key
+Get your API Key from the settings on itch.io website
+```bash
+./minitch.py config --api_key <YOUR API KEY HERE>
+```
+
+### Search for games
+```bash
+./minitch.py search <QUERY>
+```
+
+### Install game
+```bash
+./minitch.py install <GAME ID>
+```
+
+### Run game
+```bash
+./minitch.py run <GAME ID>
+```
+As itch.io has no information about the executable that should be run, you have to set the executable manually for the first time you run the game (relative to the install path):
+```bash
+./minitch.py run <GAME ID> --executable path/to/executable
+```
+To check for updates before running do:
+```bash
+./minitch.py run <GAME ID> --update
+```