Update README.md

Author: jonasjabari

docs/guides/README.md

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 # Guides overview
 Welcome to the `matestack-ui-core` guides! In here, we cover various use cases of this library, along with examples and explanations.
 
+**Note:** 
+* These guides/docs are written for `>= 1.0.0.rc.1`. If you're looking for the docs for older releases, please have a look at the github repo itself within `/docs` and select the desired version tag.
+* Most of the guides are currently in progress. Please be patient while we do our best to create content while releasing a stable 1.0.0 release which will happen this September
+
 ## Installation
 Learn how to properly set up `matestack-ui-core` with your existing Rails application - we cover both the AssetPipeline and Webpacker [in this guide](/docs/guides/1-installation/README.md).