Add conanfile.txt

Add a conanfile.txt, so that users can run "conan install ." to
build all the required dependencies.

Afterwards users can run:

  cmake -DCMAKE_TOOLCHAIN_FILE=conan_paths.cmake /path/to/qtc -GNinja

to configure using the conan-provided dependencies.

Change-Id: Id81c703fc48de4d3d66e81ef58acc60dfed48dac
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

conanfile.txt

@@ -0,0 +1,24 @@
+# This needs a special conan repository to work!
+# Please run:
+#   conan remote add qtcreator https://api.bintray.com/conan/qtcreator/qtcreator
+#   conan remote add bincrafters https://api.bintray.com/conan/bincrafters/public-conan
+# to make this repository available!
+#
+# Then do the following to build Qt Creator:
+#  1. Create a build directory and change into it
+#  2. Run "conan install /path/to/qtcreator/sources --build missing"
+#  3. Run "cmake -DCMAKE_TOOLCHAIN_FILE=conan_paths.cmake /path/to/qtcreator/sources -GNinja"
+
+[requires]
+qt/5.13.2@bincrafters/stable
+llvm/8.0.0@qtcreator/stable
+
+[generators]
+cmake_paths
+
+[options]
+qt:qtdeclarative=True
+qt:qtscript=True
+qt:qtserialport=True
+qt:qtsvg=True
+qt:qttools=True