Add some useful tips

Author: Dian-Jiao

README.md

@@ -1,5 +1,9 @@
 ![banner](http://ww1.sinaimg.cn/large/006eegdsgy1gd1eei4bqej30uk0gtgyy.jpg)
 
+Warning：Please don't use Embarcadero Dev-C++. It may cause unknown error. Using Dev-C++ 5.x is better.
+
+警告：请不要使用 Embarcadero Dev-C++ 进行编译。由于其对中文的支持不完善，可能会产生未知问题。建议使用 Dev-C++ 5.x。
+
 # Focusing Recorder
 
 Record your focused time and auto to rest / 记录专注时间并自动休息
@@ -16,3 +20,7 @@ You can use it to record your focused time, and you can stop it in any time. / 
 It can set the time you should rest depend on how much time you focus. / 它能自动计算你应该休息的时间，这取决于你的专注时间。
 
 ### Record as a Excel / 自动生成Excel
+
+Warning： Please do not keep open it across days, because I am too ~~lazy~~busy to write this part of the code.
+
+警告：不要在开着的时候跨日，因为这部分代码我还~~懒得~~没时间写。