Add README.md

Author: kaylangan

README.md

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+# GitHub Actions Virtual Environments
+This repository will contain the code that we use to create the GitHub Actions [virtual environments](https://help.github.com/en/articles/software-in-virtual-environments-for-github-actions).
+We're not quite ready to share the code and accept contributions yet. However, we want to gather your software requests and bug reports.
+Please use the issue templates to submit requests and bug reports related to the installed software.
+
+If you need help with how to set up your workflow file or use a specific tool, 
+check out the [GitHub Actions Community Forum](https://github.community/t5/GitHub-Actions/bd-p/actions).
+
+## Guidelines for what's installed
+We follow these rough guidelines when deciding what to pre-install:
+
+- Tools and ecosystems that are more popular and widely-used will be given priority.
+- More recent versions of tools will be given priority over older versions.
+- Tools and versions that are deprecated or have reached end-of-life will not be added.
+- Tools and versions will be removed 6 months after they are deprecated or have reached end-of-life.
+- If a tool can be installed during the build, we will evaluate how much time is saved
+and how much space is used by having the tool pre-installed.
+
+## Updates to the virtual environments
+_Cadence_
+
+You can expect approximately weekly updates to the software on the virtual environments.
+For some tools, we always install the latest at the time of the deployment; for others,
+we pin the tool to specific version(s).
+
+_Notifications_
+
+Right now, we don't have a great way for you to know when updates to the images are coming.
+When we have the code available here, you can watch the Releases for when we generate
+candidate environments, and when we deploy new ones.