Update issue templates

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom issue template
+about: Kamailio issue template
+
+---
+
+<!--
+Kamailio Project uses GitHub Issues only for bugs in the code or feature requests.
+
+If you have questions about using Kamailio or related to its configuration file,
+ask on sr-users mailing list:
+
+  * http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
+
+If you have questions about developing extensions to Kamailio or its existing
+C code, ask on sr-dev mailing list
+
+  * http://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-dev
+
+Please try to fill this template as much as possible for any issue. It helps the
+developers to troubleshoot the issue.
+
+If you submit a feature request (or enhancement), you can delete the text of
+the template and only add the description of what you would like to be added.
+
+If there is no content to be filled in a section, the entire section can be removed.
+
+You can delete the comments from the template sections when filling.
+
+You can delete next line and everything above before submitting (it is a comment).
+-->
+
+### Description
+
+<!--
+Explain what you did, what you expected to happen, and what actually happened.
+-->
+
+### Troubleshooting
+
+#### Reproduction
+
+<!--
+If the issue can be reproduced, describe how it can be done.
+-->
+
+#### Debugging Data
+
+<!--
+If you got a core dump, use gdb to extract troubleshooting data - full backtrace,
+local variables and the list of the code at the issue location.
+
+  gdb /path/to/kamailio /path/to/corefile
+  bt full
+  info locals
+  list
+
+If you are familiar with gdb, feel free to attach more of what you consider to
+be relevant.
+-->
+
+```
+(paste your debugging data here)
+```
+
+#### Log Messages
+
+<!--
+Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
+-->
+
+```
+(paste your log messages here)
+```
+
+#### SIP Traffic
+
+<!--
+If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
+-->
+
+```
+(paste your sip traffic here)
+```
+
+### Possible Solutions
+
+<!--
+If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix.
+-->
+
+### Additional Information
+
+  * **Kamailio Version** - output of `kamailio -v`
+
+```
+(paste your output here)
+```
+
+* **Operating System**:
+
+<!--
+Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
+Kernel details (output of `uname -a`)
+-->
+
+```
+(paste your output here)
+```