Add README for typo-po

See the README for more context on typo-po.

I drank a strong cup of coffee this morning, and I cannot quiet the activity in
my head. I'm attempting to use READMEs in my //website/sandbox to track ideas
that I would typically track using my phone's notes application. Creating a
README forces me to write more than I may have written in my phone's
notes. Also, since this repository is available at https://git.wpcarro.dev, I
can share these ideas with friends by sending them a URL! So much for "stealth
mode"... Well I guess this stress-tests my theory that ideas are less important
than execution.

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+# Typo-po
+
+Have you ever published a blog post with typos? Or perhaps you've shared a blog
+post draft with a group of friends to solicit their feedback. If anyone reads
+your blog post and finds places where they can correct your typos or suggest
+grammatical improvements they can use typo-po.
+
+## What's with the name?
+
+We police your typos. We prefer po-po to police though. Send us donuts.