[Marketing] Create marketing toolkit for CNTI Certification launch

[lixuna]

Describe the update: Create marketing toolkit for CNTI Certification launch

Describe why update is needed

• CNF WG (and CNCF’s related Cloud Native Telco efforts) has moved to LFN (see wiki)

Tasks

• [x] Create google doc for CNTI Marketing Toolkit
• [x] Draft Social media sample posts
• [ ] Share with participants and supporters to help promote the CNTI Certification