Add testing instructions and feedback gitlab template

.gitlab/issue_templates/feedback.md

+This feedback template can be used to provide feedback based on the [OAS testing instructions](https://docs.openappstack.net/en/latest/testing_instructions.html).
+
+# Installation
+
+> What problems did you encounter during installation? (If these problems prevent you from continuing with the testing process please provide some details what went wrong so we may try to help you get unstuck!)
+
+> We know that the installation process as it is right now is too technical, especially given that we want OpenAppStack to be easy to use for people that are only moderately computer-savvy.
+> We plan to make the installation process easier in the future, probably using some kind of web-based installer.
+> Even so, what do you think could be improved about the installation process or tutorial ? Did anything bother you, was something extra hard to do, or unclear?
+
+
+
+# Nextcloud
+
+> Is there anything that didn't work properly logging in or creating users, or something that you'd like to remark ?
+
+> Did you have any issues using the Nextcloud desktop client ?
+
+> Did you have any issues using the Nextcloud mobile client ?
+
+> Anything else you tried: How did you do it? What was hard and what did you like?Y
+
+
+# Onlyoffice
+
+> Creating and editing a document: Is there anything that doesn't work properly, or something that you'd like to remark?
+
+> Collaboration on the same document: Did this work properly? Is the collaboration smooth in a technical sense (i.e., no lag)?
+
+> Something you like Please think of something else you would do with OnlyOffice and describe it here. Now try to do it. How did you do it? What was hard and what did you like?
+
+> Anything else you tried: How did you do it? What was hard and what did you like?
+
+
+# Closing questions
+
+> What's missing? Now that you have gotten an idea of OpenAppStack's initial offering (Nextcloud and OnlyOffice), think of what the next thing is your organisation would need to collaborate more efficiently. Or think of a tool that you or your organisation use a lot that is also "centralised" (e.g., something exclusively provided by Google, Microsoft or a different company)
+
+> Do you have any other questions, comments, remarks, suggestions?

docs/index.rst

@@ -27,5 +27,6 @@ For more information, go to `the OpenAppStack website`_.
    :caption: Contents:
 
    installation_instructions
+   testing_instructions
    design
    reference

docs/testing_instructions.md

+# A testing guide and test reporting form for testers of the OpenAppStack project
+
+Great that you want to take OpenAppStack for a test drive.
+This tutorial contains instructions to get you going,
+some pointers on what we think would be useful to test, and guesses at what results of those tests would be
+useful to write down.
+At any point please feel invited to test whatever functionality you come across, and reporting whatever you
+think is interesting.
+
+## Installation
+
+First we'd like you to setup an OpenAppStack cluster by yourself, following the
+[installation tutorial](https://docs.openappstack.net/en/latest/installation_instructions.html).
+
+## Nextcloud
+
+### Logging into Nextcloud
+
+Please browse to https://files.$YOURPUBLICDOMAIN and try to log in.
+  The username is `admin`. The password was generated as part of the installation process and is stored in the file `clusters/CLUSTER_NAME/secrets/nextcloud_admin_password` in the `openappstack` directory of your provisioning machine (the cluster_data folder was created in the directory where you ran Ansible during the tutorial).
+
+### Creating users
+
+* After logging in to Nextcloud as `admin`, please try to create another Nextcloud user. Ideally, you would create accounts for a few of your coworkers who are willing to try the collaboration features of Nextcloud and OnlyOffice with you.
+
+### Nextcloud client application
+
+* If you feel like it, please try the [Nextcloud desktop client](https://nextcloud.com/clients/), connect it to your OpenAppStack instance, and use it to manage some files.
+* If you feel like it, please try the [Nextcloud mobile client](https://nextcloud.com/clients/) for your smartphone, connect it to your OpenAppStack instance, and use it to download and/or open some files, upload a new file, etc.
+
+
+## OnlyOffice
+
+### Creating a new office document
+
+* From the main Nextcloud webpage, please try to create a new office document, by clicking the round `plus` button near the top of the screen, then picking the `Document` type with the blue icon (third one from below on my screen), and enter a name for it. After that, please try some basic editing of the document, and save it. Maybe check you can open it again afterwards, and that it has the contents that you saved earlier.
+
+
+### Collaborating on an office document
+
+This part of the test requires the cooperation of another person; feel free to skip it now if that's not convenient at this point.
+
+* Please try to open the same office document from a few different user accounts simultaneously, and let all participants edit the document mercilessly. There are also some collaboration features that you may want to try: on the left of the OnlyOffice screen there are buttons for chat and for text comments.
+
+
+## Providing feedback
+
+If you have not done already, please create an account on [https://open.greenhost.net](https://open.greenhost.net)
+and [create a new issue](https://open.greenhost.net/openappstack/openappstack/issues/new) using the `Feedback` template.
+
+You can also provide us with your feedback via any other channel. Our contact details are listed [here](https://openappstack.net/contact.html).
+
+Thanks a lot for your testing work! We'll use your input to try to improve OpenAppStack.