bug template

.github/ISSUE_TEMPLATE/3.0_bug_report.md

@@ -0,0 +1,54 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+* **dble version：**  
+* **preconditions ：**  
+no
+* **configs：** 
+
+**cluster.cnf**  
+
+```
+
+
+```
+
+**bootstrap.cnf**  
+
+```
+
+
+```
+**db.xml**  
+
+```
+
+
+```
+
+**user.xml**  
+
+```
+
+
+```
+
+
+**sharding.xml**  
+
+```
+
+
+```
+
+* **steps：**    
+    step1.  
+* **expect result：**  
+    1.
+* **real result：**  
+    1.
+* **supplements：**  
+    1.