initial implementation of mlua for loading plugins, see todo.md in examples

src/examples/plugins/plugin.lua

@@ -0,0 +1,18 @@
+-- example plugin for http-rs ; using current api
+
+print("type(router) = " .. type(router))
+print("router = ", router)
+
+router:add_file_server("/uploads", "./uploaded_files")
+
+router:add_static("/api/status", 200, '{"status":"ok","version":"1.0"}', "application/json")
+
+print("Lua plugin loaded with the following arguments:")
+for i, v in ipairs(args) do
+    print("  arg[" .. i .. "] = " .. tostring(v))
+end
+
+if args[1] == "debug" then
+    router:add_static("/debug", 200, "Debug mode active", "text/plain")
+    print("Debug endpoint added at /debug")
+end