minor: add sync Atlas connection examples (#686)

Author: patrickfreed

Examples/Atlas/Package.swift

@@ -11,6 +11,6 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-nio", .upToNextMajor(from: "2.0.0"))
     ],
     targets: [
-        .target(name: "AtlasExamples", dependencies: ["MongoSwift", "NIO"]),
+        .target(name: "AtlasExamples", dependencies: ["MongoSwift", "MongoSwiftSync", "NIO"]),
     ]
 )

Examples/Atlas/Sources/AtlasExamples/main.swift

@@ -3,6 +3,7 @@ import MongoSwift
 import NIO
 
 /// Atlas connection string examples
+/// Please include the above imports in the snippets.
 
 func scramExample() throws {
     // START SCRAM EXAMPLE HERE

Examples/Atlas/Sources/AtlasExamples/sync.swift

@@ -0,0 +1,41 @@
+import Foundation
+import MongoSwiftSync
+
+/// Atlas connection string examples
+/// Please include the above imports in the snippet.
+
+func syncScramExample() throws {
+    // START SCRAM EXAMPLE HERE
+    let client = try MongoClient(
+        "mongodb+srv://<user>:<password>@<host>/<dbname>?retryWrites=true&w=majority"
+    )
+    defer {
+        cleanupMongoSwift()
+    }
+
+    let db = client.db("library")
+    let collection = db.collection("books")
+    // do something with collection
+    // END SCRAM EXAMPLE HERE
+}
+
+func syncX509Example() throws {
+    // START x509 EXAMPLE HERE
+    let options = MongoClientOptions(
+        credential: MongoCredential(mechanism: .mongodbX509),
+        tlsCAFile: URL(string: "/path/to/cert"),
+        tlsCertificateKeyFile: URL(string: "/path/to/cert")
+    )
+    let client = try MongoClient(
+        "mongodb+srv://<host>/<dbname>?retryWrites=true&w=majority",
+        options: options
+    )
+    defer {
+        cleanupMongoSwift()
+    }
+
+    let db = client.db("library")
+    let collection = db.collection("books")
+    // do something with collection
+    // END x509 EXAMPLE HERE
+}