Inline docs for android SDK templates

[naman1608]

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What does this PR do?

Added inline docs comments for the Android SDK templates.

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Test Plan

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Related PRs and Issues

https://github.com/appwrite/sdk-generator/issues/679 https://github.com/appwrite/sdk-generator/pull/671

(If this PR is related to any other PR or resolves any issue or related to any issue link all related PR and issues here.)

Have you read the Contributing Guidelines on issues? Yes

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[naman1608]

Could I proceed with the other pending SDKs also?

[lohanidamodar]

Could I proceed with the other pending SDKs also?

@naman1608 Thank you for your PR. Yes you can do the pending SDKs, each in its own PR.