Update README with usage instructions and example

Author: muhaiminmahi

README.md

@@ -1,102 +1,72 @@
-# swift-benchmark
-
-A Swift library for benchmarking code snippets, similar to
-[google/benchmark](https://github.com/google/benchmark).
-
-Example:
-
+# Swift Benchmark
+Swift Benchmark is a library for writing and running benchmarks in Swift.
+## Getting Started
+To use `swift-benchmark` in your project, add it to your `Package.swift` dependencies:
+```swift
+// swift-tools-version:5.3
+import PackageDescription
+let package = Package(
+name: "YourProject",
+dependencies: [
+.package(url: "https://github.com/google/swift-benchmark.git", from: "0.1.0"),
+],
+targets: [
+.target(
+name: "YourProject",
+dependencies: ["Benchmark"]),
+]
+)
+```
+Then build your project:
+```bash
+swift build
+```
+## Example Benchmark
 ```swift
 import Benchmark
-
-benchmark("add string reserved capacity") {
-    var x: String = ""
-    x.reserveCapacity(2000)
-    for _ in 1...1000 {
-        x += "hi"
-    }
+let benchmark = BenchmarkSuite(name: "Sample") { suite in
+suite.benchmark("Loop") {
+for _ in 0..<1_000_000 { }
+}
 }
-
-Benchmark.main()
+Benchmark.main([benchmark])
 ```
-
-At runtime, you can filter which benchmarks to run by using the `--filter` command line flag. For
-more details on what options are available, pass either the `-h` or `--help` command line flags.
-
-Example:
-
-```terminal
-$ swift run -c release BenchmarkMinimalExample --help
-USAGE: benchmark-command [--allow-debug-build] [--filter <filter>] [--filter-not <filter-not>] [--iterations <iterations>] [--warmup-iterations <warmup-iterations>] [--min-time <min-time>] [--max-iterations <max-iterations>] [--time-unit <time-unit>] [--inverse-time-unit <inverse-time-unit>] [--columns <columns>] [--format <format>] [--quiet]
-
-OPTIONS:
-  --allow-debug-build     Overrides check to verify optimized build.
-  --filter <filter>       Run only benchmarks whose names match the regular expression.
-  --filter-not <filter-not>
-                          Exclude benchmarks whose names match the regular expression.
-  --iterations <iterations>
-                          Number of iterations to run.
-  --warmup-iterations <warmup-iterations>
-                          Number of warm-up iterations to run.
-  --min-time <min-time>   Minimal time to run when automatically detecting number iterations.
-  --max-iterations <max-iterations>
-                          Maximum number of iterations to run when automatically detecting number iterations.
-  --time-unit <time-unit> Time unit used to report the timing results.
-  --inverse-time-unit <inverse-time-unit>
-                          Inverse time unit used to report throughput results.
-  --columns <columns>     Comma-separated list of column names to show.
-  --format <format>       Output format (valid values are: json, csv, console, none).
-  --quiet                 Only print final benchmark results.
-  -h, --help              Show help information.
-
-$ swift run -c release BenchmarkMinimalExample
-running add string no capacity... done! (1832.52 ms)
-running add string reserved capacity... done! (1813.96 ms)
-
-name                         time     std        iterations
------------------------------------------------------------
-add string no capacity       37435 ns ±   6.22 %      37196
-add string reserved capacity 37022 ns ±   1.75 %      37749
+## Running Benchmarks
+Use Swift Package Manager:
+```bash
+swift run BenchmarkMinimalExample
 ```
-
-For more examples, see
-[Sources/BenchmarkMinimalExample](./Sources/BenchmarkMinimalExample) and
-[Sources/BenchmarkSuiteExample](./Sources/BenchmarkSuiteExample).
-
-## Usage
-
-Add this library as a SwiftPM dependency:
-
-```swift
-let package = Package(
-    name: ... ,
-    products: [
-        .executable(name: "Benchmarks", targets: ["Benchmarks"])
-    ],
-    dependencies: [
-      .package(url: "https://github.com/google/swift-benchmark", from: "0.1.0")
-    ],
-    targets: [
-        .target(
-            name: "Benchmarks",
-            dependencies: [.product(name: "Benchmark", package: "swift-benchmark")]
-        )
-    ]
-)
+Example output:
 ```
-
-## Roadmap
-
-The project is in an early stage and offers only a basic set of benchmarking
-utilities. Feel free to file issues and feature requests to help us prioritize
-what to do next.
-
-## License
-
-Please see [LICENSE](LICENSE) for details.
-
+name time std iterations
+------------------------------------------------
+Loop 12.3 ms ±0.2 ms 100
+```
+## Writing Good Benchmarks
+- Keep your benchmark small and focused
+- Avoid doing I/O inside benchmark loops
+- Prefer micro-benchmarks to isolate performance of small code blocks
+- Benchmark consistent workloads
 ## Contributing
-
-Please see [CONTRIBUTING.md] for details.
-
-[CONTRIBUTING.md]: CONTRIBUTING.md
-
+We welcome contributions! If you want to improve this README or add new
+benchmarks:
+1. Fork the repository
+2. Create a new branch:
+```bash
+git checkout -b improve-readme
+```
+3. Make your changes
+4. Stage your changes:
+```bash
+git add README.md
+```
+5. Commit your changes:
+```bash
+git commit -m "Improve README with usage and example"
+```
+6. Push your branch:
+```bash
+git push origin improve-readme
+```
+7. Open a Pull Request to the main repository with a clear description
+8. Don't forget to sign the Google CLA