add nexus3

nexus3/README.md

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+nexus3
+======
+
+## docker-compose.yml
+
+```yaml
+nexus3:
+  image: sonatype/nexus3
+  ports:
+    - "8081:8081"
+  volumes:
+    - ./data:/nexus-data
+  restart: unless-stopped
+```
+
+## up and running
+
+```bash
+$ mkdir data
+$ chown -R 200 data
+$ docker-compose up -d
+```

nexus3/docker-compose.yml

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+nexus3:
+  image: sonatype/nexus3
+  ports:
+    - "8081:8081"
+  volumes:
+    - ./data:/nexus-data
+  restart: unless-stopped