add issue template

issue_template.md

@@ -0,0 +1,46 @@
+---
+name: Bug report
+about: Create a report to help us debug, it would be nice to fill the template as much as you can to help us, help you and help us all.
+
+---
+
+**How to post a meaningful bug report**
+1. *Read this whole template first.*
+2. *Determine if you are on the right place:*
+   - *If you were performing an action on the app from the webadmin or the CLI (install, update, backup, restore, change url...), you are on the right place!*
+   - *Otherwise, the issue may be due to REPLACEBYYOURAPP itself. Refer to its documentation or repository for help.*
+   - *If you have a doubt, post here, we will figure it out together.*
+3. *Delete the italic comments as you write over them below, and remove this guide.*
+--- 
+
+**Describe the bug**
+*A clear and concise description of what the bug is.*
+
+**Versions**
+- Hardware: *VPS bought online / Old laptop or computer / Raspberry Pi at home / Internet Cube with VPN / Other ARM board / ...*
+- YunoHost version: x.x.x
+- I have access to my server: *Through SSH | through the webadmin | direct access via keyboard / screen | ...*
+- Are you in a special context or did you perform some particular tweaking on your YunoHost instance ?: *no / yes*
+  - If yes, please explain:
+- Using, or trying to install package version/branch:
+- If upgrading, current package version: *can be found in the admin, or with `yunohost app info $app_id`*
+
+**To Reproduce**
+*Steps to reproduce the behavior.*
+- *If you performed a command from the CLI, the command itself is enough. For example:*
+    ```sh
+    sudo yunohost app install Webtrees
+    ```
+- *If you used the webadmin, please perform the equivalent command from the CLI first.*
+- *If the error occurs in your browser, explain what you did:*
+   1. *Go to '...'*
+   2. *Click on '....'*
+   3. *Scroll down to '....'*
+   4. *See error*
+
+**Expected behavior**
+*A clear and concise description of what you expected to happen. You can remove this section if the command above is enough to understand your intent.*
+
+**Logs**
+*After a failed command, YunoHost makes the log available to you, but also to others, thanks to `yunohost log display [log name] --share`. The actual command, with the correct log name, is displayed at the end of the failed attempt in the CLI. Execute it and copy here the share link it outputs.*
+*If applicable and useful, add screenshots to help explain your problem.*