feat: add docs

go.mod

@@ -9,13 +9,15 @@ require (
 )
 
 require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.1 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/magiconair/properties v1.8.5 // indirect
 	github.com/mattn/go-runewidth v0.0.9 // indirect
 	github.com/mitchellh/mapstructure v1.4.3 // indirect
 	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect