Add readme.md

real

readme.md

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+# frontend to [cal_filter][cfb]
+
+real
+
+[cfb]: https://git.ldlda.com/lda/cal_filter_be
+
+## usage
+
+put a valid .ics url with the right mime in the input and hit button
+
+## run
+
+```sh
+git clone this repo
+npm install
+npm run dev
+```