SWIFT-47 create repository for swift libbson bindings

 * added module map, and shim header

 * add spm Package.swift for module

 * add cocoapods podspec for module

 * fix podspec

 * add products to module

Author: mbroadst

Package.swift

@@ -0,0 +1,13 @@
+// swift-tools-version:4.0
+import PackageDescription
+let package = Package(
+    name: "libbson",
+    pkgConfig: "libbson-1.0",
+    providers: [
+        .brew(["mongo-c-driver"]),
+        .apt(["libbson-dev"])
+    ],
+    products: [
+        .library(name: "libbson", targets: ["libbson"])
+    ]
+)

SwiftBSON.podspec

@@ -0,0 +1,17 @@
+Pod::Spec.new do |spec|
+  spec.name             = "SwiftBSON"
+  spec.version          = "0.0.1"
+  spec.summary          = "Swift bindings for libbson"
+  spec.homepage         = "https://github.com/10gen/swift-bson"
+  spec.license          = "Apache License 2.0"
+  spec.author           = { "mbroadst" => "[email protected]" }
+  spec.source           = { :git => "ssh://[email protected]/10gen/swift-bson.git", :branch => "master" }
+
+  spec.osx.deployment_target = '10.9'
+  spec.swift_version = '4.0'
+  spec.requires_arc = true
+
+  spec.module_name = "libbson"
+  spec.preserve_path = "module.modulemap"
+  spec.module_map = "module.modulemap"
+end

libbson.h

@@ -0,0 +1,2 @@
+#define BCON_H_
+#include <bson.h>

module.modulemap

@@ -0,0 +1,5 @@
+module libbson [system] {
+    header "libbson.h"
+    link "bson-1.0"
+    export *
+}