add readme for tests

test/README.md

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+# Tests
+
+## Unit
+Unit tests for smart contracts. Due to their close relation, some tests create multiple real contract instances instead of using mocks.
+
+## Integration
+Run on forks only
+### Non-rebasable token (wstETH) bridging tests
+Testing the positive scenario of bridging the wstETH token. For `stETH on OP`, a series of tests were created to verify the state during the upgrade process.
+#### L1 and L2 has only wstETH bridging. Pre-stETH upgrade state.
+```bash
+npx hardhat test ./test/integration/bridging-non-rebasable-old_L1-old_L2.integration.test.ts
+```
+#### State when L1 already upgraded and L2 isn't. Half-baked stETH on Op upgrade state.
+```bash
+npx hardhat test ./test/integration/bridging-non-rebasable-new_L1-old_L2.integration.test.ts
+```
+#### State when both L1 and L2 are upgraded.
+```bash
+npx hardhat test ./test/integration/bridging-non-rebasable.integration.test.ts
+```
+## managing-e2e
+These tests are designed to run on a real blockchain and modify some important state. Therefore, they should only be used on a testnet.
+
+## e2e
+These tests are designed to run on a real blockchain. However, due to the lengthy withdrawal process on Optimism, it is necessary to manually complete the withdrawals by first running the prove step
+```bash
+export TX_HASH=<take_it_from_bridging...e2e.test.ts>
+npx ts-node --files ./scripts/optimism/prove-message.ts
+```
+and then finalizing it after 7 days.
+```bash
+export TX_HASH=<take_it_from_previouse_step>
+npx ts-node --files ./scripts/optimism/finalize-message.ts
+```
+
+
+