add README

Author: erwin-lau

README.md

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+### svg-to-stanza
+
+This is built by poet. Please install poet from https://github.com/StanzaOrg/poet
+
+Usage: `svg-to-stanza <name-without-file-extension> [span-in-mm] [stroke-width-in-mm] [ressolution-in-mm]`
+If no span, stroke-width or resolution is given, they are default to 10mm, 0.1mm, and 0.01mm respectively.
+
+Once the .stanza file is generated, you can move it to your jitpcb design directory 
+and use it by following the instruction in the .stanza file.
+
+![alt text](svg-to-stanza-mirmo.png)
+
+Dec 2022