In Readme, not obvious how to ensure binaries are in $PATH

In the past, I've installed this through homebrew, but I'm trying to follow the Readme instructions this time around. The `make` process is very simple, but I am stuck at this advice:

> Ensure the binaries from the build process are in your $PATH

How does one do this? Is there more information we might give people about the probably paths of the binaries created? It isn't made obvious in the output of the makefile (at least not to me).

My current guess is that I should update my `PATH` in `~/.bash_profile` to be something like this:

```
PATH="$PATH:/Users/stephennixon/woff2/woff2_compress:/Users/stephennixon/woff2/woff2_decompress:/Users/stephennixon/woff2/woff2_info:/Library/Frameworks/Python.framework/Versions/3.8/bin"
export PATH
```

I realize that the exact instructions may vary from person to person, but I hoping there might be slightly more we could say about this step?

If anyone sees this who happens to have advice on this, I would be very appreciative! If I figure it out first, I will try to update this and perhaps make a PR.

Thank you!