Initial project import

tools/v/vlib/readline/README.md

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+# Description
+
+The `readline` module lets you await and read user input
+from a terminal in an easy and structured manner.
+
+The module provides an easy way to prompt the user for
+questions or even make a REPL or an embedded console.
+
+# Usage:
+
+```v
+import readline
+
+mut r := readline.Readline{}
+answer := r.read_line('hello: ')!
+println(answer)
+```
+
+or just:
+
+```v
+import readline { read_line }
+
+input := read_line('What is your name: ')!
+println('Your name is: ${input}')
+```