Add PuddleSwap to Ecosystem Participant Resources

[portdeveloper]

Adds PuddleSwap under Ecosystem Participant Resources.

PuddleSwap is a static, no-backend DEX live on Monad Testnet. It uses star
routing through USDC, USDT, and WMON so any ERC-20 with a pool against one of
those routes is automatically swappable to any other. There is no signup, no
KYC, and no backend; everything is read directly from on-chain state. It is
useful for Monad builders who need:

• a quick way to source test liquidity for a new token,
• a reference DEX UX (swap, create pool, add liquidity) running fully on testnet,
• a link to share with users learning how to swap on Monad.

Links included in the entry:

• App: https://app.puddleswap.org
• Star routing explainer: https://app.puddleswap.org/learn/star-routing
• Add Monad Testnet to MetaMask: https://app.puddleswap.org/learn/add-monad-testnet-to-metamask

Entry follows the existing format of the section (project header, one-paragraph
description, trailing link list).

[greptile-apps]

Greptile Summary

This PR adds a PuddleSwap entry to the Ecosystem Participant Resources section of the community README, following the same #### Header: / description paragraph / backslash-separated link list format used by every other entry in that section.

• New entry introduces PuddleSwap as a static, no-backend DEX on Monad Testnet, describing its USDC/USDT/WMON star-routing mechanism and three useful links (app, star-routing explainer, add-network guide).
• Formatting is consistent with neighbouring entries: no trailing space after the header colon, description on the next line with a trailing \\, and the final link line has no trailing \\ — matching the pattern used by Biconomy, thirdweb, and Switchboard Oracle.

Confidence Score: 5/5

Documentation-only change that appends a new entry to an existing list; no logic, config, or code is touched.

The change is a single README addition with correct Markdown formatting, accurate link targets consistent with the PR description, and no modifications to any existing entries.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a PuddleSwap entry under Ecosystem Participant Resources, following the established heading/description/link format used by all other entries in the section.

Sequence Diagram

sequenceDiagram
    participant User
    participant PuddleSwap
    participant StarRouter as Star Router (USDC/USDT/WMON)
    participant Chain as Monad Testnet (On-chain)

    User->>PuddleSwap: Select Token A → Token B
    PuddleSwap->>Chain: Read pool state (no backend)
    Chain-->>PuddleSwap: "Pool reserves & prices"
    PuddleSwap->>StarRouter: Route A → Hub → B
    StarRouter-->>PuddleSwap: Best path via USDC/USDT/WMON
    PuddleSwap-->>User: Show quote
    User->>Chain: Submit swap tx (wallet)
    Chain-->>User: Tokens received

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