Add gorilla logo to Readme (#265)

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## What type of PR is this? (check all applicable)

- [ ] Refactor
- [ ] Feature
- [ ] Bug Fix
- [ ] Optimization
- [ ] Documentation Update

## Description

## Related Tickets & Documents

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- Related Issue #
- Closes #

## Added/updated tests?

- [ ] Yes
- [ ] No, and this is why: _please replace this line with details on why
tests
      have not been included_
- [ ] I need help with writing tests

## Run verifications and test

- [ ] `make verify` is passing
- [ ] `make test` is passing

README.md

@@ -5,6 +5,7 @@
 [![godoc](https://godoc.org/github.com/gorilla/sessions?status.svg)](https://godoc.org/github.com/gorilla/sessions)
 [![sourcegraph](https://sourcegraph.com/github.com/gorilla/sessions/-/badge.svg)](https://sourcegraph.com/github.com/gorilla/sessions?badge)
 
+![Gorilla Logo](https://github.com/gorilla/.github/assets/53367916/d92caabf-98e0-473e-bfbf-ab554ba435e5)
 
 gorilla/sessions provides cookie and filesystem sessions and infrastructure for
 custom session backends.