💻 📚 👐 Add Plain Language Summaries

About
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As identified in the January Community Session, we as a PPIE community would like to include a Plain Language Summary about each of the projects in the [AIM Community Glossary of Terms](https://aim-rsf.github.io/Glossary-of-Terms/pages/homepage.html).

What Needs to be Done:
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- [x] Create a page to host the project summaries
- [x] Add introduction to the summary page
- [x] Add page to book contents
- [x] AIM-CISC: Co-develop the summary and send for feedback
- [x] AIM-CISC: Get summary signed off
- [x] AIM-CISC: Add summary to page
- [x] AIM-CISC: Double check permission to share (and document)
- [x] AIM-CISC: Add link to program page
- [x] AI-MULTIPLY: Co-Write summary and send for feedback
- [x] AI-MULTIPLY: Get summary signed off
- [x] AI-MULTIPLY: Add summary to page
- [x] AI-MULTIPLY: Double check permission to share (and document)
- [x] AI-MULTIPLY: Add link to program page
- [ ] AI-MIXED Cluster: Co-develop summary and send for feedback
- [ ] AI-MIXED Cluster: Get summary signed off
- [ ] AI-MIXED Cluster: Add summary to page
- [ ] AI-MIXED Cluster: Double check permission to share (and document)
- [ ] AI-MIXED Cluster: Add link to program page
- [x] DECODE: Co-develop summary and send for feedback
- [x] DECODE: Get summary signed off + permission in writing - scheduled to be addressed in their team meeting on 28 February
- [x] DECODE: Add summary to page
- [x] DECODE: Add link to program page
- [x] DynAIRx: Co-develop summary and send for feedback
- [x] DynAIRx: Get summary signed off
- [x] DynAIRx: Add summary to page
- [x] DynAIRx: Double check permission to share (and document)
- [ ] DynAIRx: Add link to program page
- [x] OPTIMAL: Get summary signed off
- [x] OPTIMAL: Double check permission to share
- [x] OPTIMAL: Add summary to page
- [ ] Add cMM definition to Glossary
- [ ] Add cMM citation to OPTIMAL's summary
- [x] OPTIMAL: Add link to program page
- [x] MELD-B: Co-develop summary and send for feedback
- [x] MELD-B: Get summary signed off
- [x] MELD-B: Add summary to page
- [x] MELD-B: Double check permission to share (and Document)
- [x] MELD-B: Add link to program page

Other Information
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Some of the summaries have been shared as part of the NIHR grant proposals.

Summaries are being compiled in this folder: [community-management/plain-language-summaries](https://github.com/aim-rsf/community-management/tree/plain-lang-summaries/PPIE/plain-language-summaries)