Add readme

README.md

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+# Wayfarer
+> A simple TUI application to display Journey savefiles.
+
+
+## How to install
+
+Simply install it with cargo.
+
+```sh
+cargo install --git https://github.com/valeth/wayfarer
+```
+
+Make sure the path cargo installs to is in your system's `PATH`.
+
+```sh
+wayfarer tui <path-to-savefile>
+
+# or
+
+wayfarer show <path-to-savefile>
+```
+
+
+## TUI Keybindings
+
+| Key | Description                                         |
+|:---:| --------------------------------------------------- |
+| ESC | Return to "normal mode"                             |
+| q   | Quits the application                               |
+| o   | Open a new file                                     |
+| w   | Toggle file watcher mode (requires "watch" feature) |