🔧 Add .conan packaging data

This adds a `conan` directory with package information used for
producing and testing a conan package.

.conan/test_package/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.8)
+
+project(Expected.ConanTestPackage)
+
+include("${CMAKE_BINARY_DIR}/conanbuildinfo.cmake")
+conan_set_find_paths()
+
+find_package(Expected REQUIRED)
+
+set(source_files
+  src/main.cpp
+)
+
+add_executable(${PROJECT_NAME}
+  ${source_files}
+)
+target_link_libraries(${PROJECT_NAME}
+  PRIVATE Expected::Expected
+)

.conan/test_package/conanfile.py

@@ -0,0 +1,17 @@
+#!/usr/bin/env python
+from conans import ConanFile, CMake
+
+class ExpectedConanTest(ConanFile):
+  settings = "os", "compiler", "arch", "build_type"
+  generators = "cmake"
+
+  def build(self):
+    cmake = CMake(self)
+    cmake.configure()
+    cmake.build()
+
+  def imports(self):
+    pass
+
+  def test(self):
+    pass

.conan/test_package/src/main.cpp

@@ -0,0 +1,12 @@
+#include "expected.hpp"
+#include <iostream>
+
+auto get_return_value() noexcept -> expect::expected<int>
+{
+  return 0;
+}
+
+int main()
+{
+  return get_return_value().value();
+}