add readme

nginx/README.md

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+# nginx on debian:jessie
+
+About as simple as it gets, nginx installed on debian:jessie. Use this
+if your app is based on debian:jessie also, so they can share base.
+
+## Usage
+
+```
+docker run -d --name nginx \
+  -v /etc/nginx/sites-enabled:/etc/nginx/sites-enabled \
+  -v /var/www/html:/var/www/html \
+  -v /var/log/nginx:/var/log/nginx \
+  -p 80:80 -p 443:443 \
+  rlister/nginx
+```