doc: get started

docs/en/04-get-started.md

-# Get Started
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+---
+sidebar_label: Get Started
+title: Get Started
+description: A quick guide for how to access TDengine cloud service
+---
+
+It's very convenient to access TDengine cloud service, just open your browser, connect to [TDengine Cloud Service Portal](cloud.tdengine.com), create an account with a valid email address, activate your account, then you will get a free TDengine cloud service. Enjoy!
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