added a lovely man page

Simply build it with "npm run man"

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+viper(1) -- update and manage northstar
+=======================================
+
+## SYNOPSIS
+
+`viper` [<optional>...]
+
+## DESCRIPTION
+
+Viper is a program made to make updating and launching Northstar a lot easier. It has both a CLI and GUI tool, specifying no command line arguments opens the latter.
+
+## OPTIONS
+
+`--help`
+   Shows a brief message of all the options and what they do.
+
+`--version`
+   Various versions numbers for Node, Electron, Viper and so on.
+
+`--cli`
+   Forces the CLI to activate, meaning the GUI will never run. 
+   What purpose this has I frankly do not know.
+
+`--update`
+   Updates Northstar, this uses your `viper.json` to determine the location, it also won't try to update if the installed version of Northstar is already the newest, if you must re-install Northstar you can delete the `ns_version.txt` file in the game path.
+
+`--launch`=<version>
+   Launches Northstar, this is currently only supported on Windows.
+   If you must launch Vanilla you can run `--launch=vanilla`
+
+`--setpath`=<absolute-path>
+   Sets the game path, this'll change the `gamepath` variable in your `viper.json`, note that it only takes in absolute paths and not relative ones.
+
+## CONFIGURATION
+
+All configuration takes place in your `viper.json` file, this file may be in various locations depending on your platform, for Linux you're likely to find it at:
+
+ * `$XDG_CONFIG_HOME/viper.json`
+ * `~/.config/viper.json`
+
+On Windows it's likely to be in `%APPDATA%\viper.json`
+
+All configuration is done by Viper itself, the locale is auto set when the GUI launches through your systems locale, the gamepath is selected with `--setpath` or in the GUI.
+
+## BUGS
+
+Report bugs on the GitHub issues page, and feel free to make a pull request if you also have the fix to the bug.
+
+## AUTHORS
+
+Main contributors/maintainers to the project:
+
+ * 0neGal <mail@0negal.com>
+ * Rémy Raes <contact@remyraes.com>