Add Structure and NC-Content

docs/cicd.md

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+# CI / CD
+
+## Continuous integration
+
+## Continuous delivery

docs/docker.md

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+# Docker
+
+## Handling Builds
+
+## Handling Images
+
+## Handlicng Containers
+
+## Handling private registry

docs/network.md

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+# Network
+
+## Netcat
+Manual `man nc`
+
+### Port Scanning
+scan a single port
+```bash
+nc -v -w 2 z 192.168.56.1 22
+```
+
+scan multiple ports
+```bash
+nc -v -w 2 z 192.168.56.1 22 80
+```
+
+scan range of ports
+```bash
+nc -v -w 2 z 192.168.56.1 20-25
+```
+
+### Find a Service Running on Port
+```bash
+nc -v -n 192.168.56.110 80
+```