Create Docker Install.md

Docker Install.md

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+# Docker install method
+
+**You will need Docker for this**
+Download Docker at [Dockers official website](https://docs.docker.com/get-docker/ "Dockers official website")
+
+First clone the repo
+`git clone https://github.com/mikecao/umami.git`
+
+cd into the directory
+`cd umami`
+
+Start a Docker container
+`docker-compose up`
+
+Then navigate to `localhost:5432` in your browser!
+