[grep] initial implementation

Author: Wandalen

text/Cargo.toml

@@ -65,6 +65,10 @@ path = "src/tr.rs"
 name = "fold"
 path = "src/fold.rs"
 
+[[bin]]
+name = "grep"
+path = "src/grep.rs"
+
 [[bin]]
 name = "head"
 path = "src/head.rs"