docs: add v3 meta CIP

cips/cip-peppermint.md

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+| cip | TBD |
+| - | - |
+| title | Peppermint Network Upgrade |
+| description | Reference specifications included in the Peppermint Network Upgrade |
+| author | [@jcstein](https://github.com/jcstein) |
+| discussions-to | <https://forum.celestia.org/t/cip-v3-peppermint-network-upgrade/1826> |
+| status | Draft |
+| type | Meta |
+| created | 2024-10-01 |
+| requires | CIP-21, CIP-24, CIP-XX |
+
+## Abstract
+
+This Meta CIP lists the CIPs included in the Peppermint network upgrade.
+
+## Specification
+
+### Included CIPs
+
+- [CIP-21](./cip-21.md): Introduce blob type with verified signer
+- [CIP-24](./cip-24.md): Versioned Gas Scheduler Variables
+- CIP-XX: limiting compute per block
+
+All of the above CIPs are state breaking, and thus require a breaking network upgrade. The activation of this network upgrade will be different from future network upgrades, as described in [CIP-10](./cip-10.md).
+
+## Rationale
+
+This CIP provides a complete list of breaking changes for the Peppermint upgrade, along with links to those specs.
+
+## Security Considerations
+
+This CIP does not have additional security concerns beyond what is already discussed in each of the listed specs.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://github.com/celestiaorg/CIPs/blob/main/LICENSE).