docs: add readme

README.md

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+<p align="center">
+  <img alt="ProgressQuest" src="http://progressquest.com/pq.png">
+</p>
+
+Relive the great adventure… this time in the terminal realm!
+
+- Progress Quest site:  http://progressquest.com/
+- Online version:       http://progressquest.com/play/
+- Original version:     https://bitbucket.org/grumdrig/pq
+
+## Features
+
+- Saves (with backups) to `$XDG_CONFIG_HOME/pqcli/save.dat`
+- Clean terminal interface
+    - Smooth progress bars using UTF-8 block characters
+    - Scrollable list boxes
+- Faithful port of the game logic
+- Ideal to run on your server
+
+## How it looks like
+
+![20181106_001341_mjt](https://user-images.githubusercontent.com/1045476/48032665-d616f300-e158-11e8-8978-4ee3a69e44f8.png)
+
+## How to install
+
+If you have Python 3.7, just run `pip install --user pqcli` and you're good to go!
+Then type `pqcli` to run the game.
+
+In case if you want to use the git version, the process is just a little bit
+more complex:
+
+```console
+$ git clone https://github.com/rr-/pq-cli.git
+$ cd pq-cli
+$ pip install --user .
+```