Add readme for release process and versioning strategy

Author: haydngreatnews

README.md

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+# python-static-analysis
+
+This repo generates a docker container containing the Static analysis tools that Springload uses
+
+## Releases
+
+To generate a new container version, add a git tag to a specific commit, and push that tag to the repo
+
+Github actions will then build this container and attach tags for the major, minor and full version tags (ie, 2.1.3 would be tagged 2, 2.1 and 2.1.3)
+
+## Versioning strategy
+
+We are working with a [Semantic Versioning](https://semver.org/) strategy for releases on this container.
+
+Practically this means that a *patch* version will for be anything backwards compatible, including adding a new tool.
+
+A minor version is.... not very useful in this context, but could be a change to a tool, small package upgrades, or compatible base-container change.
+
+A major version is **anything** that would change the formatting of previously acceptable code.
+
+As such, we recommend pinning consuming repos to the *major*.