Created Installing (markdown)

Installing.md

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+## Windows
+
+- In the ttf folder, double-click each font file, click “Install font”; to install all at once, select all files, right-click, and choose “Install”
+
+*or*
+
+- Use [chocolatey](https://chocolatey.org): `choco install firacode`
+
+- Use [scoop](https://github.com/lukesampson/scoop):
+
+  *Run as administrator*
+  ```
+  scoop bucket add nerd-fonts
+  scoop install FiraCode
+  ```
+
+## macOS
+
+In the downloaded TTF folder:
+
+1. Select all font files
+1. Right click and select `Open` (alternatively `Open With Font Book`)
+1. Select "Install Font"
+
+*or*
+
+- Use [brew](http://brew.sh) and [cask](https://caskroom.github.io): 
+
+  *Not officially supported, might install outdated version*
+  ```bash
+  brew tap homebrew/cask-fonts
+  brew cask install font-fira-code
+  ```
+
+## Linux
+
+- Install a package available for your distribution following [the instructions](https://github.com/tonsky/FiraCode/wiki/Linux-instructions#installing-with-a-package-manager)
+
+*or*
+
+- In the ttf folder double-click each font file and click “Install font”; see [“Manual Installation”](https://github.com/tonsky/FiraCode/wiki/Linux-instructions#manual-installation) if double-clicking doesn't work
+
+
+## FreeBSD
+
+- Using pkg(8): `pkg install firacode`
+
+*or*
+
+- Using ports: `cd /usr/ports/x11-fonts/firacode && make install clean`