Add Description and Metadata URL to Pool

[Yunusabdul38]

Description

Expand the Pool struct to include a short description string and a URL (e.g., IPFS link) for extended metadata. This allows the frontend to display more context about the event being predicted.

Tasks

• Update Pool struct definition in lib.rs.
• Modify create_pool function to accept these new parameters.
• Update events to include metadata indicators.

Dependencies

• Issue Standardize Workspace and Crate Structure #300
• Issue Optimize Storage Usage Patterns (Ttl, Instance vs Persistent) #302

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[ayo-ola0710]

@ayo-ola0710 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi,
I will like to take these issue

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[Oshioke-Salaki]

@Oshioke-Salaki has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Please I would love to take this on. I am a well experienced smart contract developer. eta 5hrs

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