Start work on basic CLI features

+ Add basic logic for detecting conflicting configs, prompt to abort or
  continue
+ Create symlinks to configs
+ Basic usage is `kot path/to/dotfiles/`
+ Add `--backup-dir` option for setting directory for backing up configs
+ Default backup-dir to `backups/kapper` until finished testing
+ Add `--home-dir` option for setting location to install configs
+ Default home-dir setting to `dry-runs/kapper` until finished testing

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "dotfiles/dot"]
+	path = dotfiles/dot
+	url = https://gitlab.com/shaunrd0/dot