chore: create README for projects directory

projects/README.md

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+# `projects` README
+
+The `projects` directory is intended as a collective of medium-to-large-scale examples: a place to show a variety of use cases and integrations between Leptos and other libraries. Over time, our hope is that this allows us to showcase a wider variety of user examples, without the main `examples` directory becoming too overwhelming to be useful.
+
+The `examples` directory is included in our CI, and examples are regularly linted and tested. The barrier to entry for the `projects` directory is intended to be lower: Example projects will generally be built against a particular version, and not regularly linted or updated. Hopefully this distinction allows us to accept more examples without worrying about the maintenance burden of constant updates.
+
+Feel free to submit projects to this directory via PR!