docs: add CI badges and README verification tests

- Add standard CI and development status badges
- Create ReadmeVerificationTests.swift with 2 tests
- Verify basic encoding/decoding example from README
- Verify array encoding strategies example from README
- All README examples now validated via tests

Author: coenttb

README.md

@@ -1,5 +1,8 @@
 # swift-url-form-coding
 
+[![CI](https://github.com/coenttb/swift-url-form-coding/workflows/CI/badge.svg)](https://github.com/coenttb/swift-url-form-coding/actions/workflows/ci.yml)
+![Development Status](https://img.shields.io/badge/status-active--development-blue.svg)
+
 A Swift package for encoding and decoding `application/x-www-form-urlencoded` data with Codable support.
 
 ## Overview

Tests/URLFormCoding Tests/ReadmeVerificationTests.swift

@@ -0,0 +1,59 @@
+import Testing
+@testable import URLFormCoding
+
+@Suite("README Verification")
+struct ReadmeVerificationTests {
+
+    @Test("Example from README: Basic Encoding/Decoding")
+    func basicEncodingDecoding() throws {
+        struct User: Codable {
+            let name: String
+            let email: String
+            let age: Int
+        }
+
+        // Encoding
+        let encoder = Form.Encoder()
+        let user = User(name: "John Doe", email: "john@example.com", age: 30)
+        let formData = try encoder.encode(user)
+
+        // Verify encoding produces valid data
+        #expect(formData.count > 0)
+
+        // Decoding
+        let decoder = Form.Decoder()
+        let decodedUser = try decoder.decode(User.self, from: formData)
+
+        // Verify round-trip
+        #expect(decodedUser.name == user.name)
+        #expect(decodedUser.email == user.email)
+        #expect(decodedUser.age == user.age)
+    }
+
+    @Test("Example from README: Array Encoding Strategies")
+    func arrayEncodingStrategies() throws {
+        struct SearchQuery: Codable {
+            let tags: [String]
+        }
+
+        let query = SearchQuery(tags: ["swift", "ios", "server"])
+
+        // Accumulate Values (default)
+        let encoder1 = Form.Encoder()
+        encoder1.arrayEncodingStrategy = .accumulateValues
+        let data1 = try encoder1.encode(query)
+        #expect(data1.count > 0)
+
+        // Brackets (PHP/Rails style)
+        let encoder2 = Form.Encoder()
+        encoder2.arrayEncodingStrategy = .brackets
+        let data2 = try encoder2.encode(query)
+        #expect(data2.count > 0)
+
+        // Indexed Brackets
+        let encoder3 = Form.Encoder()
+        encoder3.arrayEncodingStrategy = .bracketsWithIndices
+        let data3 = try encoder3.encode(query)
+        #expect(data3.count > 0)
+    }
+}