doc(github): update issue template

Signed-off-by: Zone.N <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,7 +1,7 @@
 ---
 name: Bug report
 about: Create a report to help us improve
-title: ''
+title: "[BUG]"
 labels: bug
 assignees: ''
 
@@ -23,11 +23,12 @@ A clear and concise description of what you expected to happen.
 **Screenshots**
 If applicable, add screenshots to help explain your problem.
 
-**Desktop (please complete the following information):**
+**Env (please complete the following information):**
  - OS: [e.g. MacOS 10.14.2]
  - Compile tools: [e.g. i386-elf-gcc i386-elf-ld]
  - Emulator: [e.g. Bochs 2.6.9]
  - Branch: [e.g. TODO]
+ - Any modifications to tools/env.sh: 
 
 **Additional context**
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/help.md

@@ -0,0 +1,21 @@
+---
+name: Help
+about: any questions
+title: "[HELP]"
+labels: help wanted
+assignees: ''
+
+---
+
+**Env (please complete the following information):**
+ - OS: [e.g. MacOS 10.14.2]
+ - Compile tools: [e.g. i386-elf-gcc i386-elf-ld]
+ - Emulator: [e.g. Bochs 2.6.9]
+ - Branch: [e.g. TODO]
+ - Any modifications to tools/env.sh: 
+
+**Describe your question**
+A clear and concise description of what the question is.
+
+**Additional context**
+Add any other context about the problem here.