docs: added readme

README.md

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+# mood
+this is a silly little project to model my volatile mood
+
+can you [find](https://api.alemi.dev/mood) all my rare moods?
+
+## how it works
+it loads a file containing one entry per line, with its weight prepended:
+
+```
+10 option 1
+1 option 2
+100 option 3
+```
+
+then picks one option at random respecting weights (meaning, it's 100x more likely to get option3 than option2)
+
+it will print the result to stdout as headers, newline, body (because it's a CGI script, probably run it under fcgiwrap)
+
+important caveat: the random index changes once every minute and is always unique (it will be echoed in the response)
+
+## why it's cool
+this bin has no dependencies!
+
+also cgi is cool, for such a simple project and since i already had fcgiwrap set up, i could get this going in so little lines!
+
+also it's cool because i made it with love (: