Update SETUP.md

SETUP.md

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 TODO write about setup here
+
+# DRAFT
+
+## Reverse proxy
+
+TODO
+
+## Invidious
+
+TODO
+
+## Companions
+
+Companions are standalone servers used to distribute load onto many IP addresses. \
+If you used a single server with single IP (even rotating) you'd quickly get blocked. \
+This is faster than proxying.
+
+### Companion #2
+
+### Companion #4
+
+### Companion #5
+
+### Companion #7
+
+### Companion #8
+
+TODO those
+
+## Domains
+
+TODO