Add drone setup and doc the URI

.drone.yml

@@ -0,0 +1,21 @@
+---
+kind: pipeline
+name: deploy to swarm.autonomic.zone
+steps:
+  - name: deployment
+    image: decentral1se/drone-stack:19.03.8
+    settings:
+      compose: compose.yml
+      host: tcp://swarm.autonomic.zone:2376
+      stack_name: well_known
+      tlsverify: true
+    environment:
+      PLUGIN_CACERT:
+        from_secret: docker_cacert
+      PLUGIN_CERT:
+        from_secret: docker_cert
+      PLUGIN_KEY:
+        from_secret: docker_key
+trigger:
+  branch:
+    - master

README.md

@@ -1 +1,3 @@
 # well-known-uris
+
+- https://autonomic.zone/.well-known/matrix/server