add readme

README.md

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+# mkcert-docker
+
+> A fast and simple way to generate CA and SSL certificates for your local dev environment
+
+### How to run
+
+__Create CA and PEM certificate__
+
+```
+docker run -v $PWD:/root/.local/share/mkcert brunopadz/mkcert-docker:latest \
+/bin/sh -c "mkcert -install && \
+mkcert -cert-file /root/.local/share/mkcert/mkcert.pem \
+-key-file /root/.local/share/mkcert/mkcert.key localhost.dev"
+```
+
+### Why?
+
+Well, because it's faster running a docker container than installing via and running using your package manager.