doc: add INSTALL.md (#857)

* doc: add INSTALL.md

* doc(install): add warning phrase

* doc(install): fix syntax

* doc(install): change the install doc to be for third party

README.md

@@ -28,13 +28,14 @@ For more details about our future plans, read about upcoming features in our [ro
 Zellij was initially called "Mosaic".
 
 ## How do I install it?
-You can install it through `cargo`:
+
+You can install with `cargo`:
 
 ```
 cargo install zellij
 ```
 
-Or you can download a prebuilt binary from our [Releases](https://github.com/zellij-org/zellij/releases).
+Or you can download a prebuilt binary from our [Releases](https://github.com/zellij-org/zellij/releases), or use [Third Party Repositories](THIRD_PARTY_INSTALL.md).
 
 The default plugins make use of characters that are mostly found in [nerdfonts](https://www.nerdfonts.com/).
 To get the best experience either install nerdfonts, or use the simplified ui by starting Zellij with `zellij options --simplified-ui`, or putting `simplified_ui: true` in the config file.

THIRD_PARTY_INSTALL.md

@@ -0,0 +1,37 @@
+# Third Party Install
+
+* [Packages](#package)
+    * [Arch Linux](#arch-linux)
+    * [MacOS](#macos)
+
+## Packages
+
+ :warning: **These packages are not affiliated with the Zellij maintainers and are provided here for convenience.**
+
+[![Packaging status](https://repology.org/badge/vertical-allrepos/zellij.svg)](https://repology.org/project/zellij/versions)
+
+### Arch Linux
+You can install the `zellij` package from the [official community repository](https://archlinux.org/packages/community/x86_64/zellij/):
+
+```
+pacman -S zellij
+```
+
+Or install from AUR repository with [AUR Helper](https://wiki.archlinux.org/title/AUR_helpers):
+
+```
+paru -S zellij-git
+```
+
+### MacOS
+You can install `zellij` with [Homebrew on MacOS](https://formulae.brew.sh/formula/zellij):
+
+```
+brew install zellij
+```
+
+Or install with [MacPorts](https://ports.macports.org/port/zellij/details/):
+
+```
+port install zellij
+```