feat: create a new swift package (#1)

I did `File > New Package...` and that's pretty much it.

.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

.swiftpm/xcode/package.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Package.swift

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+// swift-tools-version: 5.10
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "honeycomb-opentelemetry-swift",
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "honeycomb-opentelemetry-swift",
+            targets: ["honeycomb-opentelemetry-swift"]),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "honeycomb-opentelemetry-swift"),
+        .testTarget(
+            name: "honeycomb-opentelemetry-swiftTests",
+            dependencies: ["honeycomb-opentelemetry-swift"]),
+    ]
+)

Sources/honeycomb-opentelemetry-swift/honeycomb_opentelemetry_swift.swift

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+// The Swift Programming Language
+// https://docs.swift.org/swift-book

Tests/honeycomb-opentelemetry-swiftTests/honeycomb_opentelemetry_swiftTests.swift

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+import XCTest
+@testable import honeycomb_opentelemetry_swift
+
+final class honeycomb_opentelemetry_swiftTests: XCTestCase {
+    func testExample() throws {
+        // XCTest Documentation
+        // https://developer.apple.com/documentation/xctest
+
+        // Defining Test Cases and Test Methods
+        // https://developer.apple.com/documentation/xctest/defining_test_cases_and_test_methods
+    }
+}