Add Flowtriq free DDoS protection certifications

[jacob-masse]

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Requirements for your pull request

• The certificate/course you want to add has to be provided for free and not a trial membership or time-based offer.
• This pull request should have the name of the course(s)/certificate(s) in the format Add Name of Course(s)/Certificate(s).
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• Not a duplicate. Please search for existing submissions.
• Make sure the course link is working.
• Has consistent formatting and proper spelling/grammar.

Details

Adds 4 free DDoS/cybersecurity certifications from Flowtriq to the Security section:

Certification	Level	Duration
Certified DDoS Protection Practitioner (CDDP)	Beginner	~15 min
Certified DDoS Mitigation Engineer (CDME)	Intermediate	~20 min
Certified DDoS Incident Commander (CDIC)	Professional	~25 min
Certified Flowtriq Consultant (CFC)	Professional	~20 min

Also adds CDDP to the Networking section since it covers network-level DDoS protection concepts (BGP FlowSpec, RTBH, cloud scrubbing).

All certifications are completely free with no trial or time-based restrictions. CDDP, CDME, and CDIC award a certificate of completion. CFC awards a digital badge with LinkedIn badge and consultant directory listing.

[jacob-masse]

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