Create InstallationGuide.md

Author: Crazelu

InstallationGuide.md

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+<div align="center">
+<img width="120" height="120" alt="CopyBear (Image Credits: Microsoft Bing Image Creator)" src="https://github.com/user-attachments/assets/20a7118c-bca9-41fc-b13e-764228e885c9">
+<h1>Install CopyBear</h1>
+</div>
+
+The app is codesigned with ad-hoc feature therefore users need to allow the Gatekeeper to open apps from an unknown developer.
+Follow the steps [here](https://support.apple.com/en-ng/guide/mac-help/mh40616/mac) for your macOS version.
+
+After allowing CopyBear to be opened, you're good to go!