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

Cargo.toml

@@ -1,8 +1,11 @@
 [package]
-name = "dotk"
+name = "kot"
 version = "0.1.0"
 edition = "2018"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+# See more keys and their definitions at
+# https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+structopt = "0.3.23"
+fs_extra = "1.2.0"