Added example of plagiarism

plagiarism/README.md

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+## Example of plagiarism
+
+As of the publishing of this document (30.03.2022), [a PhotoPrism install script](https://github.com/tteck/Proxmox/blob/d72e734dad2a2bcb7c7a80c339a907f3ca9e7f2e/setup/photoprism-install.sh) (in [tteck/Proxmox](https://github.com/tteck/Proxmox)) is based heavily on the guide in this repository, with most of the non-boilerplate parts (including .env and service file contents) copied almost verbatim. However, no attribution or copyright notice is present, despite requests.
+
+- A Github issue was created to request attribution: https://github.com/tteck/Proxmox/issues/109 (now deleted)
+
+- Author of the script initially agreed to add attribution (screenshot of Github notification email):
+  ![Screenshot 1](./email_1.png)
+  
+- Attribution was added in commit https://github.com/tteck/Proxmox/commit/380e387
+
+- Shortly afterwards, author of the script changed their mind (screenshot of Github notification email):
+  ![Screenshot 2](./email_2.png)
+  
+- Attribution was removed in commit https://github.com/tteck/Proxmox/commit/d72e734
+
+- Also, the Github issue about this was deleted.
+
+- A new issue was created, to respond to the last comment: https://github.com/tteck/Proxmox/issues/112
+
+- The new issue was almost immediately deleted, archived version is here: https://web.archive.org/web/20220330115410/https://github.com/tteck/Proxmox/issues/112#start-of-content
+
+- A Github discussion was started, to ask about why the issues are getting deleted: https://github.com/tteck/Proxmox/discussions/113
+
+- The discussion was also immediately deleted, but not before being archived: https://web.archive.org/web/20220330120625/https://github.com/tteck/Proxmox/discussions/113#start-of-content
+
+No further attempts were made to reason with the author of the script.