Including the Developer Playground as a tool for devs

[ed-marquez]

Problem

New tool available for developers. Need to document.

Solution

The pages and sections below are areas where we can include and mention the new tool:

1. https://docs.hedera.com/hedera#build-your-first-decentralized-application-dapp

• Suggested text: Learn how to use Hedera network services and build your first dApp by following these step-by-step tutorials. Alternatively, try the Hedera Developer Playground to follow the examples or to explore on your own with Hedera SDKs.

2. https://docs.hedera.com/hedera/getting-started

• Suggested section: Getting Started
• Suggested text: Add a message box below
  
  that says:
  ℹ️ Try the Hedera Developer Playground to explore services, transactions, and queries, on your own using the Hedera SDKs.

3. https://docs.hedera.com/hedera/sdks-and-apis/sdks#development-tools-and-sdks

• Let's make Developer Playground the first subheader under Development Tools and SDKs

4. https://docs.hedera.com/hedera/open-source-solutions

• Let's add a link to the Playground URL

cc: @theekrystallee

Alternatives

No response

Tasks

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1. docs: brief one page overview
2. implement all suggested solutions from above
3. include screenshot image of landing page embedded with a hyperlink out to the playground
4. publish on launch date