Add owncast documentation

docs/serviceproviders/owncast.md

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+# owncast
+
+## Proof
+
+Proofs are defined by adding the following information to the **config.yaml**:
+
+```
+    - platform: keyoxide
+      url: https://keyoxide.org/FINGERPRINT
+```
+
+If you use WKD, you could instead add:
+
+```
+    - platform: keyoxide
+      url: https://keyoxide.org/wkd/EMAIL?openpgp4fpr=FINGERPRINT
+```
+
+Make sure to replace `FINGERPRINT`.
+
+## Claim
+
+```
+https://DOMAIN
+```
+
+Make sure to replace `DOMAIN`.