reverse-proxy: added main page

wiki/reverse-proxy.md

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+# Reverse proxy
+
+A reverse proxy is an application that is upstream of back-end application and
+forwards clients to those.
+
+## Software that can be used as reverse proxy
+
+The following software can be used as reverse proxy.
+
+- [Traefik](./traefik.md) is a http and https reverse proxy with a special
+  integration of infrastructure components (e.g. [Docker](./docker.md))
+- [NGINX](./nginx.md) is a webserver that can be also used as a reverse proxy