add a cool lua repl

lib/lua-linenoise/example.lua

@@ -0,0 +1,32 @@
+local L = require 'linenoise'
+-- L.clearscreen()
+print '----- Testing lua-linenoise! ------'
+local prompt, history = '? ', 'history.txt'
+L.historyload(history) -- load existing history
+L.setcompletion(function(c,s)
+   if s == 'h' then
+    c:add('help') -- same as L.addcompletion(c,'help)
+    L.addcompletion(c,'halt') -- same as c:add('halt')
+  end
+end)
+L.sethints(function(s)
+  if s == 'h' then
+    return ' test hint'
+  end
+end)
+
+L.enableutf8()
+
+local line, err = L.linenoise(prompt)
+while line do
+    if #line > 0 then
+        print(line:upper())
+        L.historyadd(line)
+        L.historysave(history) -- save every new line
+    end
+    line, err = L.linenoise(prompt)
+end
+
+if err then
+  print('An error occurred: ' .. err)
+end