Create README.md

README.md

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+# mmr_can
+
+You can add this library to your project by either cloning it or adding it as a submodule (if you've already created a git repo)
+
+---
+
+### Add as a submodule (recommended)
+You can add the library to an existing STM32 project if you've already initialized it with a git repository
+
+To create a git repository, simply run `git init` inside the main project folder<br>
+You will then be able to link it to a remote repository (like github) by running `git remote add origin repo_url`
+
+To **add mmr_can as a submodule**, go into your main folder _(where you ran git init)_ and run
+```
+git submodule add https://github.com/cala-br/mmr_can.git Drivers/MMR_CAN
+```
+
+mmr_can will be cloned inside the `Drivers` folder
+
+#### Compiler setup
+After adding the submodule, right click on your project's name from within the STM32CubeIDE, then `Properties (last option) > C/C++ General > Paths and Symbols`
+
+You'll see a list of directories on the right, click on `Add`, then type `Drivers/MMR_CAN/Inc` and press enter
+
+Once you've done this you'll be ready to go
+
+---
+
+### Clone
+Simply `cd` into the directory you want to clone the library and run
+```
+git clone https://github.com/cala-br/mmr_can.git
+```