Add macos build instructions

BUILD_MACOS.md

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+Here are the instructions to anyone whom wants to try the build themselves.
+It is assumed that you have `brew` installed, know your way around terminal, and generally understand what you're doing.
+
+## Build
+
+1. Start with an already existing build instructions of the original project:
+
+`https://github.com/dino/dino/wiki/macOS`
+
+2. On step 4, replace the path to the upstream repo with this one:
+
+```
+git clone https://github.com/mxlgv/dino
+cd dino
+```
+
+3. On step 5 run `./configure --with-libsoup3`.
+
+4. Continue the build according to the original instructions.
+
+## Install with Brew
+
+TODO
+
+## Notifications
+
+There is a draft PR which can be used to enable notifications: https://github.com/mxlgv/dino/pull/45
+
+## Start Dino
+
+In order to run Dino, just run in the build folder:
+
+`./dino`