Update README.md

add how to use this lib.

README.md

@@ -1,2 +1,110 @@
 # xException
 This is Pretty beautiful error log, You can listen the error and then to do special job!
+
+# 使用样例
+
+local x_error = require("xexception")
+
+function listenError(...)
+
+    print("need to restart ...")
+
+    local temp = { ... }  
+
+    local arg = select("1", temp) 
+
+    --返回第一个参数和其之后的所有参数 
+
+    for i=1,#arg do
+
+            -- print(arg[i])
+            
+    end 
+
+end
+
+
+x_error.setCallback(listenError)
+
+--测试 tryCatchError
+
+x_error.tryCatchError(function(arg)
+
+    for i=1,#arg do
+
+            print("tryCatchError arg"..i, arg[i])
+            
+            -- error('error..')
+            
+            n = n/nil
+    end  
+
+    -- n = n/nil
+
+end,10,11,12,"lua")
+
+print()
+
+-- 测试 catchException
+
+x_error.catchException(function(arg)
+
+    for i=1,#arg do
+
+            print("catchException arg"..i, arg[i])
+            
+            error('error..')
+            
+            -- n = n/nil
+            
+    end  
+
+    -- n = n/nil
+
+end,100,101,102,"lua")    --输出为100,101,102,lua
+
+print()
+
+
+-- 测试使用x_error.try, x_error.catch 自定义逻辑
+
+x_error.try {
+
+        function ()
+        
+            error('hello error')
+            
+        end
+        
+       ,
+       
+       x_error.catch {
+       
+          function(error)
+          
+             print('custom error handler...',error)
+             
+          end
+          
+       }
+       
+}
+
+# 输出日志
+
+tryCatchError arg1      10
+---------------------------------------- TRACKBACK START ----------------------------------------
+stack traceback:
+test.lua:18: attempt to perform arithmetic on a nil value (global 'n')
+---------------------------------------- TRACKBACK  END  ----------------------------------------
+need to restart ...
+
+catchException arg1     100
+---------------------------------------- TRACKBACK START ----------------------------------------
+stack traceback:
+        [C]: in function 'error'
+        test.lua:27: in upvalue 'func'
+---------------------------------------- TRACKBACK  END  ----------------------------------------
+need to restart ...
+
+custom error handler... test.lua:36: hello error