Created Embedding (markdown)

Embedding.md

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+If you want to use TMK for your own keyboard project, you've got three options for embedding the [core][1].  
+The recommended option is [subtrees](#1-git-subtree).
+
+After adding the embed you'll need to [modify the Makefile](#modifications-to-the-makefile) of your project to point to the core correctly.
+
+## 1. git subtree
+
+In order to set up the subtree in your project, first add the core repository as a remote:  
+```
+git remote add -f core https://github.com/tmk/tmk_core
+```
+
+Then add the core as a subtree (directory) in your local repository:  
+```
+git subtree add -P tmk_core core master --squash
+```
+
+And that's it!
+
+When you want to update the subtree in your repository to match the master on [tmk_core][1], do this:  
+```
+git subtree pull -P tmk_core core master --squash
+```
+
+## 2. git submodule
+
+In order to set up the submodule in your project, first add a new submodule:  
+```
+git submodule add https://github.com/tmk/tmk_core tmk_core
+```
+
+Then pull, sync and update the submodule:  
+```
+git pull
+git submodule sync --recursive
+git submodule update --init --recursive
+```
+
+And that's it!
+
+When you want to update the subtree in your repository to match the master on [tmk_core][1], follow the same steps as above.
+
+If you want to clone a repository from GitHub that has submodule(s) in it, pass <kbd>--recursive</kbd> when cloning, like so:  
+`git clone --recursive https://github.com/<username>/<repository>`
+
+## 3. Manually (without git)
+
+*Note: This is not recommended in any way, but it's still possible.*
+
+Download a zipped version of the [tmk_core][1] repository using this link:  
+<https://github.com/tmk/tmk_core/archive/master.zip>
+
+Extract the zip in your project's directory, then rename the folder to <kbd>tmk_core</kbd>.
+
+## Modifications to the *Makefile*
+
+The one thing you have to make sure to change in the *Makefile* (compared to [tmk_keyboard](https://github.com/tmk/tmk_keyboard) drivers' *[Makefile](https://github.com/tmk/tmk_keyboard/blob/master/keyboard/gh60/Makefile#L45)*) is the "TMK_DIR" variable, which needs to point to the embed directory:  
+```Makefile
+TMK_DIR = ./tmk_core
+```
+
+[1]: https://github.com/tmk/tmk_core