Create readme.md

sites/opto.sic.pt/readme.md

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+# opto.sic.pt
+
+https://opto.sic.pt/guia-tv
+
+### Download the guide
+
+```sh
+npm run grab --- --site=opto.sic.pt
+```
+
+### Update channel list
+
+```sh
+npm run channels:parse --- --config=./sites/opto.sic.pt/opto.sic.pt.config.js --output=./sites/opto.sic.pt/opto.sic.pt.channels.xml
+```
+
+### Test
+
+```sh
+npm test --- opto.sic.pt
+```