Add setup doc

Author: arifszn

docs/setup.md

@@ -0,0 +1,60 @@
+---
+sidebar_position: 2
+sidebar_label: Setup
+hide_title: true
+---
+
+### Installation
+
+The currently supported python version is ***Python 3.8.**** You need to have this version of python in your OS to continue any of the following steps.
+
+**Method 1: with pipx**
+
+The best way to setup any python app is manage it via [pipx](https://pypa.github.io/pipx/). Pipx is a standred pypi python application manager.
+
+First, [Install pipx](https://pypa.github.io/pipx/installation/). Then run
+
+```bash
+$ pipx install chk
+```
+
+**Method 2: with pip (globally)**
+
+Alternatively you can install with `pip` like other regular python package following these step. However, it will install the package globally.
+
+```bash
+$ python3 -m pip install -U pip # upgrade pip
+$ python3 -m pip install -U chk
+```
+
+**Method 3: with pip (locally)**
+
+To install under a seperate environment, that don't change your global package space. Install under a virtual env.
+
+```bash
+$ python3 -m venv .venv # create virtual environemnt
+$ source .venv/bin/activate # active virtual environemnt
+$ pip install -U pip # upgrade pip
+$ pip install -U chk
+```
+
+---
+### Upgrade
+
+If you have installed with **pipx** then use following to upgrade to latest released version.
+
+```bash
+$ pipx upgrade chk
+```
+
+Otherwise, if **pip** was used to install then same process given above should work for upgrade as well.
+
+---
+### Platform support
+
+For now this tool is developed and tested on **macOS** only. We are working hard to make it available on Linux platform.
+
+---
+### Stability 
+
+Current stability for this tool is _Pre - Alpha_