Add sol spec

docs/sol.md

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+# CCC Solana Lock Specification
+
+This specification describes a CCC lock script that can interoperate with the Solana blockchain. Some common designs, definitions, and conventions can be found in the [overview](./overview.md).
+
+## Lock Script
+
+A CCC Solana lock script has following structure:
+
+```
+Code hash: CCC Solana lock script code hash
+Hash type: CCC Solana lock script hash type
+Args:  <ed25519 pubkey, 32 bytes>
+```
+
+The ed25519 pubkey can be also decoded from an Solana address by base58 decoding.
+
+## Witness
+
+The corresponding witness must be a proper `WitnessArgs` data structure in molecule format. In the lock field of the WitnessArgs, a 64 bytes ed25519 signature must be present.
+
+## Unlocking Process
+
+The following bytes are verified:
+
+"Signing a CKB transaction: 0x{sigh_hash}\n\nIMPORTANT: Please verify the integrity and authenticity of connected SOL wallet before signing this message\n"
+
+The `{sighasl_all}` is replaced by `sighash_all` in hexadecimal string, with length 64. The string in the last part can be displayed in wallet UIs.
+
+## Examples
+
+```yaml
+CellDeps:
+    <vec> CCC Solana lock script cell
+Inputs:
+    <vec> Cell
+        Data: <...>
+        Type: <...>
+        Lock:
+            code_hash: <CCC Solana lock script code hash>
+            args: <ed25519 pubkey, 32 bytes>
+Outputs:
+    <vec> Any cell
+Witnesses:
+    <vec> WitnessArgs
+      Lock: <signature, 64 bytes>
+```
+
+
+
+## Notes
+
+An implementation of the lock script spec above has been deployed to CKB mainnet and testnet:
+
+- mainnet
+
+| parameter   | value                                                                |
+| ----------- | -------------------------------------------------------------------- |
+| `code_hash` | TODO   |
+| `hash_type` | `type`                                                               |
+| `tx_hash`   | TODO   |
+| `index`     | `0x0`                                                                |
+| `dep_type`  | `code`                                                               |
+
+- testnet
+
+| parameter   | value                                                                |
+| ----------- | -------------------------------------------------------------------- |
+| `code_hash` | TODO   |
+| `hash_type` | `type`                                                               |
+| `tx_hash`   | TODO   |
+| `index`     | `0x0`                                                                |
+| `dep_type`  | `code`                                                               |
+
+Reproducible build is supported to verify the deployed script. To build the deployed script above, one can use the following steps:
+
+```bash
+TODO
+```