add lua sample and definition file in lua

meta/uname.lua

@@ -0,0 +1,25 @@
+---@meta uname
+
+---@class unamelib
+local uname = {}
+
+---@param x integer
+---@return integer
+---@nodiscard
+function uname.numid(x) end
+
+---@param x integer
+---@return integer
+---@nodiscard
+function uname.plusone(x) end
+
+---@class uname
+---@field sysname string
+---@field machine string
+---@field release string
+---@field version string
+
+---@return uname
+function uname.uname() end
+
+return uname

test_uname.lua

@@ -0,0 +1,27 @@
+---@module 'uname'
+local uname
+uname = require'uname'
+
+print(uname)
+
+for k, v in pairs(uname) do
+    print(k, v)
+end
+
+print("numid", uname.numid(1))
+do
+    local result, ret = xpcall(uname.numid, debug.traceback, "a", "b")
+    if not result then
+        io.stderr:write("error" .. ret .. "\n")
+    else
+        print("result: " .. ret)
+    end
+end
+
+print(type(uname.uname()))
+print("uname")
+for k, v in pairs(uname.uname()) do
+    print(k, v)
+end
+print("OS is " .. uname.uname().sysname)
+