Add simple configuration

simple/README.md

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+# Simple configuration
+
+Running `./start.sh` will perform some cleanup then start the containers in a simple configuration.
+When running, the system looks like this:
+
+```
+                   +--------------------------+
+                   |                          |
+                   |      172.60.0.10         |
+                   |      +--------+          |
+(XMPP-C2S)   5222 -|      |        |          |
+(XMPP-S2S)   5269 -|------| XMPP 1 +          |
+(HTTP-Admin) 9090 -|      |        |          |
+(BOSH)       7070 -|      +----+---+          |
+                   |           |              |
+                   |           |              |
+                   |       +---+--+           |
+                   |       |      |           |
+(Database)   5432 -|-------|  DB  +           |
+                   |       |      |           |
+                   |       +------+           |
+                   |      172.60.0.11         |
+                   |                          |
+                   +-----172.60.0.0/24--------+
+```
+
+Openfire is configured with the following XMPP domain:
+
+* `xmpp.localhost.example`
+
+Openfire is configured with the following FQDN:
+
+* `xmpp1.localhost.example`
+
+The following users are configured:
+
+* `admin` `admin`
+* `user1` `password`
+* `user2` `password`
+
+The following MUC rooms are configured:
+
+* `muc1`
+* `muc2`
+
+## Network
+
+The Docker compose file defines a custom bridge network with a single subnet of `172.60.0.0/24`.

simple/docker-compose.yml

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+version: '3.7'
+
+services:
+
+  db:
+    image: library/postgres:9.6.24-alpine
+    ports:
+      - "5432:5432"
+    environment:
+      - "POSTGRES_DB=openfire"
+      - "POSTGRES_USER=openfire"
+      - "POSTGRES_PASSWORD=hunter2"
+    volumes:
+      - ./sql:/docker-entrypoint-initdb.d
+    networks:
+      openfire-net:
+        ipv4_address: 172.60.0.11
+
+  xmpp1:
+    image: "openfire:${OPENFIRE_TAG}"
+    ports:
+      - "5222:5222"
+      - "5269:5269"
+      - "7070:7070"
+      - "7443:7443"
+      - "9090:9090"
+    depends_on:
+      - "db"
+    volumes:
+      - ./_data/xmpp/conf:/var/lib/openfire/conf
+      - ./_data/plugins:/opt/plugins
+      - ../_common/wait-for-it.sh:/wait-for-it.sh
+    command: ["/wait-for-it.sh", "-s", "db:5432", "--", "/sbin/entrypoint.sh"]
+    networks:
+      openfire-net:
+        ipv4_address: 172.60.0.10
+    extra_hosts:
+      - "xmpp1.localhost.example:172.60.0.10"
+      - "conference.xmpp1.localhost.example:172.60.0.10"
+
+  dozzle:
+    image: amir20/dozzle:latest
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+    ports:
+      - 9999:8080
+
+networks:
+  openfire-net:
+    driver: bridge
+    ipam:
+      driver: default
+      config:
+        - subnet: 172.60.0.0/24