Brings conan package management to qtpromise.

I have uploaded it to personal conan-repository(https://fish.jfrog.io/artifactory/api/conan/fish-conan), dependence: QtPromise/master
TODO:
1, Need to add test_package for testing
2, Need to upload to conan-center, better with ci/cd

conanfile.py

@@ -0,0 +1,30 @@
+import os
+
+from conans import ConanFile
+
+
+class QtPromiseConfig(ConanFile):
+    name = "QtPromise"
+    version = "master"
+    license = "QtPromise is available under the MIT license."
+    author = "simonbrunel"
+    url = "https://github.com/simonbrunel/qtpromise"
+    description = "Promises/A+ implementation for Qt/C++"
+    settings = "os", "compiler", "build_type", "arch"
+
+    def package_id(self):
+        self.info.header_only()
+
+    def source(self):
+        self.run("git clone git@github.com:simonbrunel/qtpromise.git")
+
+    def package(self):
+        self.copy("*", dst="include", src="./qtpromise/include")
+        self.copy("*", dst="src", src="./qtpromise/src")
+
+    def package_info(self):
+        self.cpp_info.libs = self.collect_libs()
+
+
+if __name__ == '__main__':
+    os.system("conan create .")