adds INSTALLATION.md

INSTALLATION.md

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+### Installing Zotify
+
+> **Windows**
+
+This guide uses *Scoop* (https://scoop.sh) to simplify installing prerequisites and *pipx* to manage Zotify itself. 
+There are other ways to install and run Zotify on Windows but this is the official recommendation, other methods of installation will not receive support.
+
+- Open PowerShell (cmd will not work)
+- Install Scoop by running:
+  - `Set-ExecutionPolicy RemoteSigned -Scope CurrentUser`
+  - `irm get.scoop.sh | iex`
+- After installing scoop run: `scoop install python ffmpeg-shared git`
+- Install pipx:
+  - `python3 -m pip install --user pipx`
+  - `python3 -m pipx ensurepath`
+Now close PowerShell and reopen it to ensure the pipx command is available.
+- Install Zotify with: `pipx install https://get.zotify.xyz`
+- Done! Use `zotify --help` for a basic list of commands or check the *README.md* file in Zotify's code repository for full documentation.
+
+> **macOS**
+- Open the Terminal app
+- Install *Homebrew* (https://brew.sh) by running: `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
+- After installing Homebrew run: `brew install python@3.11 pipx ffmpeg git`
+- Setup pipx: `pipx ensurepath`
+- Install Zotify: `pipx install https://get.zotify.xyz`
+- Done! Use `zotify --help` for a basic list of commands or check the README.md file in Zotify's code repository for full documentation.
+
+> **Linux (Most Popular Distributions)**
+- Install `python3`, `pip` (if a separate package), `ffmpeg`, and `git` from your distribution's package manager or software center.
+- Then install pipx, either from your package manager or through pip with: `python3 -m pip install --user pipx`
+- Install Zotify `pipx install https://get.zotify.xyz`
+- Done! Use `zotify --help` for a basic list of commands or check the README.md file in Zotify's code repository for full documentation.