Add hello world C lib

.gitignore

@@ -1 +1,2 @@
 *.luo
+lunaclib/lunaclib.so

lunaclib/build.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+cc -shared $(pkg-config --cflags luajit) lunaclib.c $(pkg-config --libs luajit) -o lunaclib.so
+

lunaclib/lunaclib.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <lua.h>
+#include <lauxlib.h>
+
+static int hello(lua_State* L) {
+    puts("Hello World!");
+    return 0;
+}
+
+static const struct luaL_Reg lib[] = {
+    {"hello", hello},
+    {NULL, NULL}
+};
+
+int luaopen_lib (lua_State *L) {
+    luaL_openlib(L, "lunaclib", lib, 0);
+    return 1;
+}
+