Initial commit: DHCP Deep Dive with Wireshark course structure

Course scaffolding with 8 module placeholders, README overview,
and 4 diagram PNGs for the Packet Inspector training material.

README.md

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+# Packet Inspector: DHCP Deep Dive with Wireshark
+
+A comprehensive, hands-on course for network engineers and IT professionals who want to master DHCP troubleshooting using Wireshark packet analysis.
+
+## Course Overview
+
+This course takes you from Wireshark fundamentals through advanced DHCP analysis, covering real-world troubleshooting scenarios that network engineers encounter daily. By the end, you'll be able to capture, filter, and interpret DHCP traffic with confidence.
+
+## Modules
+
+| # | Module | Description |
+|---|--------|-------------|
+| 1 | [Wireshark Fundamentals](modules/01-wireshark-fundamentals.md) | Installation, interface, capture filters, and display filters |
+| 2 | [DHCP Message Flow](modules/02-dhcp-message-flow.md) | The DORA process, lease lifecycle, and packet-level analysis |
+| 3 | [DHCP Options](modules/03-dhcp-options.md) | Common options, vendor-specific extensions, and option overloading |
+| 4 | [DHCP Relay](modules/04-dhcp-relay.md) | Relay agent operation, Option 82, and cross-subnet DHCP |
+| 5 | [Advanced Wireshark](modules/05-advanced-wireshark.md) | Custom columns, profiles, coloring rules, and scripting |
+| 6 | [Troubleshooting](modules/06-troubleshooting.md) | Real-world scenarios, common failures, and systematic debugging |
+| 7 | [DHCPv6](modules/07-dhcpv6.md) | IPv6 address assignment, SLAAC vs DHCPv6, and prefix delegation |
+| 8 | [DHCP Security](modules/08-dhcp-security.md) | DHCP snooping, rogue server detection, and starvation attacks |
+
+## Diagrams
+
+The `diagrams/` folder contains visual aids referenced throughout the modules:
+
+- **Diagram 1** - Lab Topology
+- **Diagram 2** - DHCP DORA with Relay Flow
+- **Diagram 3** - DHCP Packet Structure
+- **Diagram 4** - Troubleshooting Flowchart
+
+## Prerequisites
+
+- Basic networking knowledge (IP addressing, subnetting)
+- A computer with Wireshark installed (v3.x or later recommended)
+- Access to a lab environment or virtual network (GNS3, EVE-NG, or physical gear)
+
+## License
+
+This course material is provided for educational purposes.

modules/01-wireshark-fundamentals.md

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+# Module 1: Wireshark Fundamentals

modules/02-dhcp-message-flow.md

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+# Module 2: DHCP Message Flow

modules/03-dhcp-options.md

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+# Module 3: DHCP Options

modules/04-dhcp-relay.md

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+# Module 4: DHCP Relay

modules/05-advanced-wireshark.md

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+# Module 5: Advanced Wireshark

modules/06-troubleshooting.md

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+# Module 6: Troubleshooting

modules/07-dhcpv6.md

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+# Module 7: DHCPv6

modules/08-dhcp-security.md

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+# Module 8: DHCP Security