MG: Identify and describe setting up an android developer account.

[olivegamestudio]

Context

articles/tutorials/advanced/MobileDeployment/01_getting_started/index.md

Required Tools:

• Android Device Manager - Used to set up simulators (accessible through Visual Studio)
• Android SDK Manager - Used to install the SDK platforms

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(MonoGame#169 (comment))

iOS mentions having an iOS developer account. Is the same setup not also required for Android?

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