🙈 Exclude examples/point from workspace

[phatblat]

Running the suggested make command in the examples/point subdir resulted in the following error:

safer_ffi/examples/point on  master is 📦 v0.1.0 via C v15.0.0-clang via 🦀 v1.66.1 on ☁️  (us-west-2)  ❯
make
cargo build # --release
error: current package believes it's in a workspace when it's not:
current:   /Users/phatblat/dev/ditto/safer_ffi/examples/point/Cargo.toml
workspace: /Users/phatblat/dev/ditto/safer_ffi/Cargo.toml

this may be fixable by adding `examples/point` to the `workspace.members` array of the manifest located at: /Users/phatblat/dev/ditto/safer_ffi/Cargo.toml
Alternatively, to keep it out of the workspace, add the package to the `workspace.exclude` array, or add an empty `[workspace]` table to the package's manifest.
make: *** [Makefile:7: rustlib] Error 101

In this PR I've excluded example/point from the workspace and ignored its Cargo.lock so that it doesn't need to be updated.

If it would make more sense to include the example in the workspace, I can rework this to do that instead.

[danielhenrymantilla]

Good catch, thanks! ✅

[danielhenrymantilla]

Suggested change

exclude = ["examples/point"]

This can also be achieved by adding:

[workspace]

at the end of examples/point/Cargo.toml, which I personally prefer as it's about examples/point "seeing itself out" 😄