Document how to separate work vs personal personas in gitconfig.

content/05-appendix.md

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+# Appendix
+## Managing work vs personal emails in git
+In the world of open source, folks may have an online identity that pre-dates
+their employment with our current organization. Simultaneously, the organization
+may want contributions done on their behalf to happen with corporate emails.
+
+One way that folks can solve this is by encoding their commit email on a
+per-repository basis, like:
+
+```
+git config user.email "[email protected]"
+```
+
+
+If you work with several repositories, this will become difficult to manage and
+easy to forget. Instead, we can use a feature of git which allows different
+configurations based on our directory structures.
+
+Our `~/.gitconfig` file might look like this:
+
+```
+[user]
+	name = Simba Lion
+	email = [email protected]
+
+[includeIf "gitdir:~/my-company/"]
+    path = ~/my-company/.gitconfig
+```
+
+This sets our default email (which, in this case, is for a personal
+account). If we have repositories in the `~/my-company` directory, we'll load an
+additional git config file which is located at `~/my-company/.gitconfig`. That
+file might look like:
+
+```
+[user]
+	email = [email protected]
+```
+
+Now when our user commits changes, it will use their personal email by default,
+or their corporate email for any repositories within the `~/my-company`
+folder. Note that the name attribute is inherited from the base configuration,
+so we don't need to double specify it.