Mention the old directory for original dependency installation

Author: ekilmer

README.md

@@ -1,3 +1,7 @@
+ATTENTION: This repo was recently updated to use [`vcpkg`](https://github.com/microsoft/vcpkg) for managing dependencies.
+
+Until all of the `lifting-bits` tools are updated to mention something about `vcpkg`, you can find the original way to install dependencies in the [`old`](./old) directory.
+
 # VCPKG Ports Registry for common C/C++ packages
 
 Curated dependencies that are compatible with the [lifting-bits](https://github.com/lifting-bits) tools.