Add screenshot command

Author: piscisaureus

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 name = "ptywrap"
 version = "0.1.0"
-edition = "2021"
+edition = "2024"
 
 [dependencies]
 clap = { version = "4", features = ["derive"] }
@@ -11,3 +11,5 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 anyhow = "1"
 libc = "0.2"
+image = { version = "0.25", default-features = false, features = ["png"] }
+font8x8 = "0.3"