Add README files for rustapi-jobs and rustapi-testing

Introduces documentation for the rustapi-jobs and rustapi-testing crates, outlining their features, usage, and example code to help users get started with background job processing and testing utilities for the RustAPI framework.

Author: Tuntii

crates/rustapi-jobs/README.md

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+# RustAPI Jobs
+
+Robust background job processing for the RustAPI framework.
+
+## Features
+
+- **Multiple Backends**: Support for Redis and PostgreSQL backends.
+- **Reliable Processing**: At-least-once delivery guarantees.
+- **Retries**: Configurable retry policies with exponential backoff.
+- **Scheduled Tasks**: Cron-like scheduling for recurring jobs.
+- **Async Processing**: Fully async/await based on Tokio.
+
+## Usage
+
+Add to your `Cargo.toml`:
+
+```toml
+[dependencies]
+rustapi-jobs = { version = "0.1", features = ["redis"] }
+```
+
+### Defining a Job
+
+```rust
+use rustapi_jobs::{Job, JobContext};
+use serde::{Serialize, Deserialize};
+
+#[derive(Serialize, Deserialize)]
+struct EmailJob {
+    to: String,
+    subject: String,
+    body: String,
+}
+
+#[async_trait]
+impl Job for EmailJob {
+    const NAME: &'static str = "send_email";
+
+    async fn run(&self, _ctx: JobContext) -> Result<(), Error> {
+        // Send email...
+        Ok(())
+    }
+}
+```
+
+### Enqueueing Jobs
+
+```rust
+let queue = RedisQueue::new("redis://localhost:6379").await?;
+queue.push(EmailJob {
+    to: "user@example.com".to_string(),
+    subject: "Welcome!".to_string(),
+    body: "Hello...".to_string(),
+}).await?;
+```

crates/rustapi-testing/README.md

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+# RustAPI Testing
+
+Testing utilities and test harness for the RustAPI framework.
+
+## Features
+
+- **TestClient**: A wrapper around `reqwest` and `hyper` for testing your API endpoints integration.
+- **Fluid Assertions**: Custom matchers for status codes, headers, and body content.
+- **Mocking**: Helpers for mocking dependencies (if applicable).
+- **Proptest Integration**: Strategies for property-based testing of handlers.
+
+## Usage
+
+Add to `dev-dependencies`:
+
+```toml
+[dev-dependencies]
+rustapi-testing = "0.1"
+```
+
+### Example
+
+```rust
+use rustapi_testing::TestClient;
+use rustapi::status::StatusCode;
+
+#[tokio::test]
+async fn test_create_user() {
+    let client = TestClient::new(app());
+    
+    let res = client.post("/users")
+        .json(&json!({ "name": "Alice" }))
+        .send()
+        .await;
+        
+    res.assert_status(StatusCode::OK);
+    res.assert_json_snapshot!("create_user_response");
+}
+```