jQuery: create README for 2023 and list updates

Signed-off-by: Timmy Willison <timmywil@users.noreply.github.com>

alpha/engagements/2023/jquery/README.md

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+## Alpha Engagement: jQuery 
+
+The purpose of this Alpha engagement is to provide security resources to the jQuery project
+in key areas, including:
+
+* Secure the consumer web
+* Reduce potential security incidents for jQuery by modernizing its consumers and its code
+* Conduct an ecosystem sercurity risk audit
+* Modernize Infrastructure
+* Web Modernization Campaign
+
+### Timeline
+
+This engagement started in December 2022 and is expected to continue through at least December 2023.
+
+### Monthly Updates
+
+* [Janurary 2023](update-2023-01.md)
+* [February 2023](update-2023-02.md)
+* [March 2023](update-2023-03.md)
+* [April 2023](update-2023-04.md)
+* [May 2023](update-2023-05.md)
+* [June 2023](update-2023-06.md)
+* [July 2023](update-2023-07.md)
+
+### Primary Contacts
+
+* Robin Ginn - OpenJS
+* Timo Tijhof (@krinkle) - Wikimedia
+* Timmy Willison (@timmywil) - OpenJS
+
+### Announcement / News
+
+* <https://openssf.org/blog/2022/10/24/openssf-project-alpha-omega-invests-in-the-openjs-foundation-and-jquery-to-help-secure-the-consumer-web/>
+* <https://openjsf.org/category/jquery/>
+