Update GitHub issue template

With this, there will be a guide to report bugs, enhancements or
features, and issues will be automatically labeled.

Author: adam8157

.github/issue_template.md .github/ISSUE_TEMPLATE/bug-report.md

@@ -1,3 +1,11 @@
+---
+name: "\U0001F41B Bug Report"
+about: As a user, I want to report a bug.
+labels: "type: bug"
+---
+
+## Bug Report
+
 ### Greenplum version or build
 
 ### OS version and uname -a
@@ -11,4 +19,3 @@
 ### Actual behavior
 
 ### Step to reproduce the behavior
-

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,7 @@
+contact_links:
+  - name: Join Greenplum users mailing list
+    url: https://groups.google.com/a/greenplum.org/g/gpdb-users
+    about: Please ask  general questions here.
+  - name: Join Greenplum developers mailing list
+    url: https://groups.google.com/a/greenplum.org/g/gpdb-dev
+    about: Please ask developing questions here.

.github/ISSUE_TEMPLATE/enhancement.md

@@ -0,0 +1,7 @@
+---
+name: "\U0001F680 Enhancement"
+about: As a developer, I want to make an enhancement.
+labels: "type: enhancement"
+---
+
+## Enhancement

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,13 @@
+---
+name: "\U0001F680 Feature Request"
+about: As a user, I want to request a new feature.
+labels: "type: feature"
+---
+
+## Feature Request
+
+**Is your feature request related to a problem? Please describe:**
+<!-- A clear and concise description of what the problem is. -->
+
+**Describe the feature you'd like to request:**
+<!-- A clear and concise description of what you want to happen. -->