feat: Add CI/CD workflows for testing and publishing SAL crates

- Add a workflow for testing the publishing setup
- Add a workflow for publishing SAL crates to crates.io
- Improve crate metadata and version management
- Add optional dependencies for modularity
- Improve documentation for publishing and usage

vault/README.md

@@ -1,7 +1,16 @@
-# SAL Vault
+# SAL Vault (`sal-vault`)
 
 SAL Vault is a comprehensive cryptographic library that provides secure key management, digital signatures, symmetric encryption, Ethereum wallet functionality, and encrypted key-value storage.
 
+## Installation
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+sal-vault = "0.1.0"
+```
+
 ## Features
 
 ### Core Cryptographic Operations