Initial proper documentation

docs/getstarted/account.md

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+# Logging in
+
+Some useful features of this library require an active login session with Apple in order to work correctly.
+That's because the remote endpoints require authentication to actually retrieve data.
+This page will guide you through the steps needed to log into an Apple account using FindMy.py.

docs/getstarted/index.md

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+# Getting Started
+
+* * *
+
+```{toctree}
+:maxdepth: 1
+:glob:
+
+*
+```