docs: adding NEWS with prior documentation of extant GH releases

Author: njlyon0

NEWS.md

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+## Development Version
+
+This reflects the current state of the repository. Changes from the preceding version/GitHub release are listed here as they are made.
+
+- Streamlined / clarified workshop preparation steps
+
+## Version 1.2
+
+Features include:
+
+- Added alt text to all images in every section of the workshop
+- Standardized image embedding syntax to be exclusively HTML
+    - Previously was markdown syntax for images that were 100% width and HTML for others
+- Fixed some minor typos in the plain text
+
+## Version 1.1
+
+Features include:
+
+- Expanded 'server' module to demonstrate several modes of uploading data to a server (including useful screenshots for key steps)
+
+## Version 1.0
+
+This is the first functioning version of the workshop in this GitHub Organization. Previously the workshop was hosted in [this Github repository](https://github.com/NCEAS/scicomp-workshop-collaborative-coding) but we've chosen to migrate it here from now on.
+
+Features include:
+
+- All content from the workshop's prior location
+- Consistent alt text for images in workshop home page
+    - Priority for next release is adding alt text to _all_ images throughout workshop