Add release instructions

Author: rgomezp

RELEASE_INSTRUCTIONS.md

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+# Release Instructions
+1. Generate new client version using OpenApi Generator
+2. Create a new PR and merge
+   * Carefully review the PR to ensure nothing is overwritten and you are including all desired changes
+   * Ensure the correct version number is being sent in the header params `OS-Usage-Data` (`api_client.rb`)
+3. Publish to RubyGems
+   * To publish version 0.1.0 of a new gem called 'squid-utils', run: `gem push squid-utils-0.1.0.gem`
+   * To publish a beta version, simply add `.beta1`, `.beta2` etc... after the semantic version (e.g: `1.0.0.beta1`)
+