fix: Update clickgraph-client and add documentation

- Fix Cargo edition from 2024 to 2021 (2024 doesn't exist)
- Lower rust-version to 1.70 to match main project
- Fix typo: 'brahamnd' -> 'ClickGraph' in welcome message
- Add Interactive CLI Client section to README with usage examples
- Tested build: clickgraph-client.exe compiles successfully (4MB binary)

Resolves issue with building clickgraph-client package

Author: genezhang

README.md

@@ -272,6 +272,53 @@ Both protocols share the same underlying query engine and ClickHouse backend.
 
 📖 **[Complete Setup Guide →](docs/getting-started.md)**
 
+---
+
+## 💻 Interactive CLI Client
+
+ClickGraph includes an interactive command-line client for easy querying:
+
+### Build and Run
+
+```bash
+# Build the client
+cargo build --release -p clickgraph-client
+
+# Run with default settings (connects to http://localhost:8080)
+./target/release/clickgraph-client
+
+# Or connect to a custom server
+./target/release/clickgraph-client --url http://your-server:8080
+```
+
+### Usage
+
+```
+clickgraph-client :) MATCH (u:User) RETURN u.name LIMIT 5
+
+Tim Duncan
+Tony Parker
+LaMarcus Aldridge
+Manu Ginobili
+Boris Diaw
+
+clickgraph-client :) MATCH (u:User)-[:FOLLOWS]->(friend) WHERE u.user_id = 101 RETURN friend.name
+
+Tim Duncan
+LaMarcus Aldridge
+
+clickgraph-client :) <Ctrl+C or Ctrl+D to exit>
+I'll be back:)
+```
+
+**Features**:
+- Interactive REPL with history support
+- Automatic result formatting (JSON or text)
+- Command history (up/down arrows)
+- Simple connection to any ClickGraph server
+
+---
+
 ## 📊 View-Based Graph Model
 
 Transform existing relational data into graph format through YAML configuration:

brahmand-client/Cargo.toml

@@ -1,8 +1,8 @@
 [package]
 name = "clickgraph-client"
 version = "0.0.1"
-edition = "2024"
-rust-version = "1.85"
+edition = "2021"
+rust-version = "1.70"
 
 [dependencies]
 clap = { version = "4", features = ["derive"] }

brahmand-client/src/main.rs

@@ -15,7 +15,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let args = Args::parse();
     let client = Client::new();
 
-    println!("\nConnected to brahamnd server at {}.\n", args.url);
+    println!("\nConnected to ClickGraph server at {}.\n", args.url);
 
     let mut rl = DefaultEditor::new()?;