docs: added install page for brew (#1006)

docpages/03_installing.md

@@ -9,4 +9,5 @@ There are many ways to install D++, either from a package manager, or from sourc
 * \subpage install-windows-vs-zip
 * \subpage install-windows-clion-vcpkg
 * \subpage install-xmake
+* \subpage install-brew
 * \subpage install-from-source

docpages/install/install-brew.md

@@ -0,0 +1,32 @@
+\page install-brew Installing from Homebrew (OSX)
+
+To install D++ from brew, follow the steps below:
+
+```bash
+brew install libdpp
+brew link libdpp
+```
+
+This command will install libdpp and setup links.
+
+If it can't detect libdpp, please do `brew update` and repeat the steps above.
+
+You will now be able to use D++ by including its library on the command line:
+
+```bash
+clang++ -std=c++17 -L/opt/homebrew/lib -I/opt/homebrew/include -ldpp mybot.cpp -o mybot
+```
+
+\include{doc} install_prebuilt_footer.dox
+
+## Uninstalling & Unlinking
+
+To unlink and uninstall dpp, run
+```bash
+brew unlink libdpp
+brew uninstall libdpp
+```
+
+\note As a precaution, double check inside `/opt/homebrew/lib` and `/opt/homebrew/include` to make sure that libdpp does not exist. If it does, remove files/folders relating to libdpp. If there are files left here and you don't remove them, you may see issues arise with different versions of D++. Sometimes, it may still act like some version of D++ exists, if it does that then please restart your system!
+
+**Have fun!**