add: add lua.

Signed-off-by: Eglinux <eg@mac.local>

README.md

@@ -1,2 +1,2 @@
 # eglinux
-www.eglinux.com source code
+www.eglinux.com source code

docs/lua/index.md

@@ -0,0 +1,55 @@
+---
+title: Lua
+description: 上善若水，水善利万物而不争！
+icon: simple/lua
+---
+
+# Lua
+
+上善若水，水善利万物而不争！
+
+``` shell
+╭─eg@mac ~
+╰─$ lua
+Lua 5.4.6  Copyright (C) 1994-2023 Lua.org, PUC-Rio
+> print("Hello, world")
+Hello, world
+>
+```
+
+Lua 保留字：
+
+``` lua
+and     break   do      else    elseif
+end     false   goto    for     function
+if      in      local   nil     not
+or      repeat  return  then    true
+until   while
+```
+
+Lua 基本类型：
+
+``` shell
+╭─eg@mac ~
+╰─$ lua
+Lua 5.4.6  Copyright (C) 1994-2023 Lua.org, PUC-Rio
+> type(nil)
+nil
+> type(true)
+boolean
+> type(10.4 * 3)
+number
+> type("Hello world")
+string
+> type(io.stdin)
+userdata
+> type(print)
+function
+> type(type)
+function
+> type({})
+table
+> type(type(X))
+string
+>
+```

mkdocs.yml

@@ -215,6 +215,8 @@ nav:
     - python/index.md
   - Qt:
     - qt/index.md
+  - Lua:
+    - lua/index.md
 
 
 copyright: >