Added basic issue template

.github/issue_template.md

@@ -0,0 +1,24 @@
+**Issue type:**
+
+[ ] question
+[ ] bug report
+[ ] feature request
+[ ] documentation issue
+
+**nestjs-config version**
+<!-- enter version tag here -->
+
+**@nestjs/common+core or other package versions**
+ - @nestjs/common: <!-- 5.2 | 5.* -->
+ - @nestjs/core: 
+
+#### Excepted behavior 
+
+#### Actual behavior or outcome (for issue)
+
+#### Replication/Example
+
+<!-- Please provide an example of how you {except to use, used} nestjs-config -->
+
+```ts
+```