Add Docker Compose example (#11)

* Add Docker Compose example

* Revert README.md

* Move docker-compose sample to examples folder

* docker-compose folder has its own config.yaml

example/docker-compose/docker-compose.yml

@@ -0,0 +1,8 @@
+version: "3.8"
+services:
+    gatus:
+        image: twinproduction/gatus:latest
+        ports:
+          - 8080:8080
+        volumes:
+          - ./config.yaml:/config/config.yaml