Add PR template for adding tokens to the reqistry

.github/pull_request_template.md

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+# Pull Request Template
+
+## Description
+
+Please provide a brief description of the changes you are making in this PR.
+
+## Author's Checklist ✅
+
+- [ ] **Choose the correct environment folder** (devnet/mainnet/testnet)
+- [ ] **Verified JSON structure** (Check example: [Token Registry Examples](https://github.com/CoreumFoundation/token-registry?tab=readme-ov-file#examples))
+
+### **Token Bridging**
+- [ ] If you want this token to be **bridgable to XRPL**, tick this flag.
+
+## Important Notes
+
+Once this PR is merged, your asset will automatically become visible on the respective explorer page:
+
+- **Devnet**: [Explorer](https://explorer.devnet-1.coreum.dev/coreum)
+- **Testnet**: [Explorer](https://explorer.testnet-1.coreum.dev/coreum)
+- **Mainnet**: [Explorer](https://explorer.coreum.com/coreum)
+
+If you selected Token Bridging your asset will be added to Coreum XRPL Bridge smart contract.
+After that is done it will become available for bridging on [Sologenic](https://sologenic.org/bridge/coreum-bridge) or [Pulsara](https://dax.pulsara.io/bridge)
+
+
+Thank you for contributing to the Coreum Token Registry! 🚀