Update README.md

README.md

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 # docker-selfhosted-server
 My Hobby Server for Self-Hosted Applications on Docker
+
+## Usage
+
+In each application directory resides a `sample-env` file, which includes the required environment variables that you can copy to `.env`:
+
+```
+$ cd folder/
+$ cp sample-env .env
+# modify .env to desired values
+```
+
+## Included Applications
+
+I will add more over time:
+
+- `traefik`
+- `bitwarden`
+- `rocket-chat`
+- `grafana loki`