Add README.md for use-multisig

examples/substrate/use-multisig/README.md

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+# Multisig Pallet
+
+[![Run in StackBlitz](https://img.shields.io/badge/Open_in_StackBlitz-1269D3?style=for-the-badge&logo=stackblitz&logoColor=white)](https://stackblitz.com/github/futureversecom/trn-examples?file=examples%2Fsubstrate%2Fuse-multisig%2FREADME.md&title=Futurepass%20Pallet%20Examples) [![Pallet Documentation](https://img.shields.io/badge/Pallet_Documentation-black?style=for-the-badge&logo=googledocs&logoColor=white)](https://docs-beta.therootnetwork.com/buidl/substrate/pallet-multisig)
+
+> [!IMPORTANT]
+> Ensure the following ENV vars are available before running the examples
+>
+> - `CALLER_1_PRIVATE_KEY` - Private key of an account #1 that submits the multisig transaction.
+> - `CALLER_2_PRIVATE_KEY` - Private key of an account #2 that submits the multisig transaction.
+> - `CALLER_3_PRIVATE_KEY` - Private key of an account #3 that submits the multisig transaction.
+
+> Follow this guide to [create and fund an account with some test tokens](../../GUIDES.md) on Porcini (testnet) if you don't have one yet.
+
+## Examples
+
+```bash
+# change your working directory to this example first
+cd examples/substrate/use-multisig
+
+# export all required environments
+export CALLER_1_PRIVATE_KEY=
+export CALLER_2_PRIVATE_KEY=
+export CALLER_3_PRIVATE_KEY=
+
+# call an simple extrinsic as multisig
+pnpm call:callSystemRemark
+
+# call an FPass proxy extrinsic as multisig
+pnpm call:callProxyExtrinsic
+
+```