Update README.md

Add more samples

README.md

@@ -6,10 +6,13 @@ For an overview of some of my work, see the links below.
 + **2023** Organization: medium.com (blog). [The Art and Science of Writing Sprint Goals](https://drive.google.com/file/d/1lHCvHwQbq5K2MqXOHgrtXEZhYeg-e-uh/view?usp=drive_link)
 + **2023** Organization: TextNow. [Kanban in a Nutshell](https://drive.google.com/file/d/1rTlwILsBqlumDAv3EyCbNPNUIJB7_9WN/view?usp=drive_link)
 + **2022** Organization: Bookboon (publisher). [eBook: Easy to Use Team Facilitation Techniques](https://drive.google.com/file/d/1cQrK5aRhM6p4QQ_EVSlKh1kT4YRxqmVS/view?usp=drive_link)
+* **2021** Organization: USCIS (Excella). [Checklist for Tech Challenge Part I](https://drive.google.com/file/d/1Iepm2AOwhj-07sKGPcfcjl8L25dQB4wM/view?usp=drive_link). Additional context: This is a document I prepared, in conjuction with other documents I wrote on the Team GitHub wiki, to outline our approach during a seven-day technical challenge. Excellaa ultimately won the challenge, and the contract.
 + **2020** Organization: CFPB (Excella). [Portfolio, Program, and Project Management in an Agiile Context](https://drive.google.com/file/d/1F-kbZhVd5tmggmysWvSk6SBhwGrmxBJf/view?usp=drive_link)
++ **2021** Organization: Excella. [Guidelines for Section 508 (Accessibility) Compliance](https://drive.google.com/file/d/1lGtSixp6GkaLk_f39IIXBHbJftAiijca/view?usp=drive_link)
 + **2020** Organization: UATP (Excella). [Role Descriptions](https://drive.google.com/file/d/1O8okuKGVA-cR62p7c93YDo5O63FZU1uA/view?usp=drive_link)
 + **2019** Organization: 14 West (Excella). [Models for Establishing Agile Practices](https://drive.google.com/file/d/1AJq01kOLwm0Z934tBzOM54aVHBDznKGY/view?usp=drive_link)
 + **2018** Organization: NIH [Agile Practice Observations](https://drive.google.com/file/d/1Wqg49B9SEFLtxxcKeEspkWqCd8OV-wYN/view?usp=drive_link)
 + **2017** Organization: Evolent Health [Meeting Faciiitation Cheat Sheet](https://drive.google.com/file/d/1V-oQibVdedi7AuBRCTwXbMG1w4e30Twc/view?usp=drive_link) 
-+ **2016** Organization: NPR. [Stakeholder Reviews: Guide to Getting Meaningful Feedback](https://drive.google.com/file/d/1HHM4mr3ZFXPhbtrFi9N387gslcEKpQRC/view?usp=drive_link)
++ **2015** Organization: NPR. [Stakeholder Reviews: Guide to Getting Meaningful Feedback](https://drive.google.com/file/d/1HHM4mr3ZFXPhbtrFi9N387gslcEKpQRC/view?usp=drive_link)
++ **2014** Organization: NPR. [Slacking On and Slacking Off: Slack Productivity Hacks](https://drive.google.com/file/d/1S6YomVI41oFwH8Z6TZgvr2-BYXVJrkp_/view?usp=drive_link)
 + **2013** Organization: Project Management Institute. [Conference Paper, co-authored with Dr. Ahmed Sidky: ITILity - Delivering Business Value via the Nexus of Lean-Agile and IT Service Management](https://www.pmi.org/learning/library/overview-software-development-operations-agile-5835)