Add XMBL grant application

[34r7h]

This PR adds the XMBL grant application for a decentralized media content management and distribution platform built on Substrate.

Summary

XMBL is a Substrate-based blockchain solution for content creation, distribution, and monetization in the Web3 ecosystem. The platform provides decentralized infrastructure for media content management with cross-chain interoperability through Polkadot.

Application Details

• Level: 2
• Team: XMBL
• Focus: Content management pallets, creator economics, licensing, and XCM integration

The application includes detailed technical specifications, roadmap with 2 milestones, and comprehensive ecosystem fit analysis.

Grant Level

• Level 2: Up to $30,000, 3 approvals

Application Checklist

• The application template has been copied and aptly renamed (XMBL.md).
• I have read the application guidelines.
• Payment details have been provided (Polkadot AssetHub (USDC & DOT) address in the application and bank details via email, if applicable).
• I understand that an agreed upon percentage of each milestone will be paid in vested DOT, to the Polkadot address listed in the application.
• I am aware that, in order to receive a grant, I (and the entity I represent) have to successfully complete a KYC/KYB check.
• The software delivered for this grant will be released under an open-source license specified in the application.
• The initial PR contains only one commit (squash and force-push if needed).
• The grant will only be announced once the first milestone has been accepted (see the announcement guidelines).
• I prefer the discussion of this application to take place in a private Element/Matrix channel. My username is: @_______:matrix.org (change the homeserver if you use a different one)

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[34r7h]

I have read and hereby sign the Contributor License Agreement.