Update readme and add versioning doc

Author: jhalterman

README.md

@@ -10,7 +10,7 @@ Failsafe is a lightweight, zero-dependency library for handling failures in Java
 
 ## Usage
 
-Visit [failsafe.dev](https://failsafe.dev) for docs, usage info, and more.
+Visit [failsafe.dev](https://failsafe.dev) for usage info, docs, and additional resources.
 
 ## Contributing
 

VERSIONING.md

@@ -0,0 +1,9 @@
+### Versioning
+
+Failsafe follows MAJOR.MINOR.PATCH versioning where:
+
+- MAJOR versions contain significant new features and potentially significant incompatible API changes.
+- MINOR versions contain new features and potentially minor yet incompatible API changes.
+- PATCH versions contain bug fixes and minor new features that are fully backwards compatible.
+
+All versions, new features, and API changes are described in the [CHANGELOG](CHANGELOG.md).