Adding docs to help with setting up tmux.

tmux/README.md

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+# Shaun's `tmux` Dotfiles
+
+## Location
+The configuration files need to be present at this location, `~/.config/tmux`. So, we can use the following command to softlink/symlink,
+
+```bash
+ln -s <location of cloned dotfiles tmux directory> ~/.config/tmux
+# e.g.
+# ln -s ~/dotfiles/tmux ~/.config/tmux
+```
+
+## Install Plugin Manager (`tpm`)
+We will use `tpm` as our plugin manager, but it cannot install itself. So we have to clone it into the proper place.
+`git clone https://github.com/tmux-plugins/tpm ~/.config/tmux/plugins/tpm`
+
+## Install Plugins
+Once the tmux symlink is created, we can install all plugins. This is done using tpm from within a tmux session.
+```bash
+tmux
+<leader> I
+# e.g.
+# Ctrl+b Shift+i 
+```