Add expdb as git submodule (Exploit-DB mirror)

[RndU53r]

Summary

• Adds expdb/ as a git submodule pointing to the Exploit-DB mirror maintained at RndU53r/expdb.
• Updates README.md with repository structure, submodule clone instructions, and upstream link.

Why submodule (not copy/subtree)

The expdb mirror is ~GB-scale (full Exploit-DB tree + external/ CVE collections). A submodule keeps the main repo lightweight while giving researchers a pinned, reproducible reference to the full exploit archive.

Usage

# Fresh clone with submodule
git clone --recurse-submodules https://github.com/SecuritySilverbacks/sap-security-research.git

# Existing clone
git submodule update --init --recursive

See expdb/README.md for SearchSploit usage and external/ CVE source details.

Test plan

• Submodule added at expdb/ → https://github.com/RndU53r/expdb.git
• .gitmodules committed
• README documents structure and clone workflow
• Maintainer confirms submodule URL and update policy are acceptable

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