update issue template

ISSUE_TEMPLATE.md

@@ -1,9 +1,7 @@
-- English is preferred;
-- Make the title as meaningful as possible;
-- One issue for only one thing, since large issues are difficult to remember and handle;
-- When reporting problems, elaborate it as detailed as possible like:
-    - Version of VNote, which operating system;
-    - What is the symptoms;
-    - What action triggered it;
-    - How to reproduce it;
-- Please delete all these text and put whatever you want below. :)
+- 1 issue that costs user 1 minute to compose may take the dev 10 minutes to figure it out before coding;
+- 1 issue that costs user 10 minutes to compose may take the dev just 1 minute to figure it out before coding;
+- 100 1-minute issues by 100 users may take the dev **1000** minutes to figure it out before coding.
+
+- 一个用户花1分钟写好的问题，可能得耗费开发者10分钟去理解清楚，然后才是写代码解决问题；
+- 一个用户花10分钟写好的问题，可能只需要开发者1分钟去理解清楚，然后写代码解决问题；
+- 由100个用户在1分钟内写好的100个问题，可能会耗费开发者**1000**分钟去理解清楚，然后才是写代码解决问题。