Prepare CLI for move into mainline

packages/cli/docs/src/plugin/interface/log.md

@@ -0,0 +1,48 @@
+# Log Functions
+
+> You can use log function to print some useful log info
+
+### Trace(info: string)
+
+Print trace log info
+
+```lua
+local log = plugin.log
+log.trace("trace information")
+```
+
+### Debug(info: string)
+
+Print debug log info
+
+```lua
+local log = plugin.log
+log.debug("debug information")
+```
+
+### Info(info: string)
+
+Print info log info
+
+```lua
+local log = plugin.log
+log.info("info information")
+```
+
+### Warn(info: string)
+
+Print warning log info
+
+```lua
+local log = plugin.log
+log.warn("warn information")
+```
+
+### Error(info: string)
+
+Print error log info
+
+```lua
+local log = plugin.log
+log.error("error information")
+```