Add local conanfile.py

- Bump version to 0.4.0

conanfile.py

@@ -0,0 +1,80 @@
+from conan import ConanFile
+from conan.tools.files import get, copy
+from conan.tools.layout import basic_layout
+from conan.tools.build import check_min_cppstd
+from conan.errors import ConanInvalidConfiguration
+import os
+
+
+required_conan_version = ">=1.50.0"
+
+
+class BoostLEAFConan(ConanFile):
+    name = "boost-leaf"
+    version = "0.4.0"
+    license = "BSL-1.0"
+    url = "https://github.com/conan-io/conan-center-index"
+    homepage = "https://github.com/boostorg/leaf"
+    description = ("Lightweight Error Augmentation Framework")
+    topics = ("multi-platform", "multi-threading", "cpp11", "error-handling",
+              "header-only", "low-latency", "no-dependencies", "single-header")
+    settings = "os", "compiler", "arch", "build_type"
+    exports_sources = "include/*", "LICENSE_1_0.txt"
+    no_copy_source = True
+
+    def package_id(self):
+        self.info.clear()
+
+    @property
+    def _min_cppstd(self):
+        return "11"
+
+    @property
+    def _compilers_minimum_version(self):
+        return {
+            "gcc": "4.8",
+            "Visual Studio": "17",
+            "msvc": "141",
+            "clang": "3.9",
+            "apple-clang": "10.0.0"
+        }
+
+    def requirements(self):
+        pass
+
+    def validate(self):
+        if self.settings.get_safe("compiler.cppstd"):
+            check_min_cppstd(self, self._min_cppstd)
+
+        def lazy_lt_semver(v1, v2):
+            lv1 = [int(v) for v in v1.split(".")]
+            lv2 = [int(v) for v in v2.split(".")]
+            min_length = min(len(lv1), len(lv2))
+            return lv1[:min_length] < lv2[:min_length]
+
+        compiler = str(self.settings.compiler)
+        version = str(self.settings.compiler.version)
+        minimum_version = self._compilers_minimum_version.get(compiler, False)
+
+        if minimum_version and lazy_lt_semver(version, minimum_version):
+            raise ConanInvalidConfiguration(
+                f"{self.name} {self.version} requires C++{self._min_cppstd}, which your compiler ({compiler}-{version}) does not support")
+
+    def layout(self):
+        basic_layout(self)
+
+    def package(self):
+        copy(self, "LICENSE", dst=os.path.join(
+            self.package_folder, "licenses"),  src=self.source_folder)
+        copy(self, "*.h", dst=os.path.join(self.package_folder, "include"),
+             src=os.path.join(self.source_folder, "include"))
+        copy(self, "*.hpp", dst=os.path.join(self.package_folder,
+             "include"), src=os.path.join(self.source_folder, "include"))
+
+    def package_info(self):
+        self.cpp_info.set_property("cmake_target_name", "boost::leaf")
+
+        self.cpp_info.bindirs = []
+        self.cpp_info.frameworkdirs = []
+        self.cpp_info.libdirs = []
+        self.cpp_info.resdirs = []