Update docs.

README.md

@@ -4,13 +4,16 @@ This repository includes Go code to interact with pass, the Unix password
 manager. Library code is provided to open a password store, list
 saved passwords, and decrypt specified passwords. The library provides
 a simple passphrase input function, or, if gpg-agent is running (on MacOS),
-it will connect automatically to request your GPG passphrase.
+it will connect automatically to request your GPG passphrase. MacOS users
+can also ask passgo to copy a password directly to the clipboard.
 
 ```go
-store, err := passgo.GetStore()
+store := passgo.Store{}
+// directory defaults to ~/.password-store, or set it manually here:
+// store.Dir = "/home/me/.pw-store"
+err := passgo.GetStore(&store)
 if err != nil { ... }
 passlist := store.List()
-//storeDir := store.Dir
 for _,x := range passlist {
 	if x.Pathname = "myPass" {
 		p, err := store.Decrypt(x.Pathname)
@@ -22,3 +25,6 @@ for _,x := range passlist {
 	}
 }
 ```
+
+Also included is a simple GUI front-end using [Gio](gioui.org). See
+`cmd/passgo-gui`.