Add RELEASES-flare.md file

Author: mboben

RELEASES-flare.md

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+# Release Notes: Flare and Songbird networks
+
+Here are listed specific changes to the code for the Flare and Songbird networks. For a comprehensive list of general changes, see [here](./avalanchego/RELEASES.md) for the AvalancheGo project and [here](./coreth/RELEASES.md) for the Coreth project.
+
+## [v1.10.0]
+
+The changes go into effect on May 6, 2025 at 12 PM UTC for the Songbird network and on May 13, 2025 at 12 PM UTC for the Flare network.
+
+### Specific changes:
+
+- Return delegators in `platform.getCurrentValidators` when the environment variable `COMPLETE_GET_VALIDATORS` is set to `true`. (Only the number of delegators is returned by default unless only one node is specified.)
+
+- `AddPermissionlessValidatorTx` and `AddPermissionlessDelegatorTx` transactions are enabled for the primary network (they were disabled in 1.9.0) and are the preferred way to add delegators and validators as we plan to disable `AddValidatorTx` and `AddDelegatorTx` transactions in v1.11.0 to align with Avalanche.
+
+- Reduce the target gas (for the 10-second rolling window used for dynamic fee calculation) to 15,000,000 from 150,000,000 for the Songbird network to be consistent with the Flare network.
+
+## [v1.9.0]
+
+### Specific changes:
+
+- `AddPermissionlessValidatorTx` and `AddPermissionlessDelegatorTx` transactions are disabled.
+
+- Subnets are disabled.
+
+- We allow Ethereum-style signatures for P-chain transactions ([EIP-191](https://eips.ethereum.org/EIPS/eip-191)).