Add tool infrastructure

tool/CMakeLists.txt

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+# Copyright (C) 2017 Jonathan Müller <jonathanmueller.dev@gmail.com>
+# This file is subject to the license terms in the LICENSE file
+# found in the top-level directory of this distribution.
+
+add_executable(cppast_tool main.cpp)
+target_link_libraries(cppast_tool PUBLIC cppast cxxopts)
+set_target_properties(cppast_tool PROPERTIES CXX_STANDARD 11
+                                             OUTPUT_NAME cppast)

tool/main.cpp

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+// Copyright (C) 2017 Jonathan Müller <jonathanmueller.dev@gmail.com>
+// This file is subject to the license terms in the LICENSE file
+// found in the top-level directory of this distribution.
+
+#include <iostream>
+
+int main()
+{
+}