add github issue_template.md

.github/issue_template.md

@@ -0,0 +1,26 @@
+((Note: Please write in English))
+((Short description of the issue in issue title))
+
+(Description of the issue)
+
+### Expected results
+
+(Description of what should be the result)
+
+### Actual results
+
+(Description of what you get as result)
+
+### Path to disaster
+
+```
+(Code snippet of the disastrous libpairtwo code)
+```
+
+### Libpairtwo version
+
+(Version tag or git commit hash)
+
+### PHP version
+
+(PHP-version you encountered the issue with)