Add v17 WEC-SIM Python logo assets

README.md

@@ -1,5 +1,9 @@
 # wec-sim-python
 
+<p align="center">
+  <img src="docs/branding/wec-sim-python-horizontal-readme.svg" alt="WEC-SIM Python logo: a snake in a hardhat beside a buoy" width="600">
+</p>
+
 [![RM3 case parity](https://img.shields.io/endpoint?url=https%3A%2F%2Fraw.githubusercontent.com%2Fcmudrc%2Fwec-sim-python%2Fmaster%2Fdocs%2Frm3-cases.json)](PARITY.md#reference-model-and-case-inventory)
 [![OSWEC case parity](https://img.shields.io/endpoint?url=https%3A%2F%2Fraw.githubusercontent.com%2Fcmudrc%2Fwec-sim-python%2Fmaster%2Fdocs%2Foswec-cases.json)](PARITY.md#reference-model-and-case-inventory)
 [![Sphere case parity](https://img.shields.io/endpoint?url=https%3A%2F%2Fraw.githubusercontent.com%2Fcmudrc%2Fwec-sim-python%2Fmaster%2Fdocs%2Fsphere-cases.json)](PARITY.md#reference-model-and-case-inventory)

docs/branding/README.md

@@ -0,0 +1,11 @@
+# Logo artwork
+
+The [primary](wec-sim-python-primary.svg) and
+[horizontal](wec-sim-python-horizontal.svg) SVGs are the original v17 artwork
+supplied for this repository. Both are self-contained vector files.
+
+The repository README displays
+[a white-backed copy of the horizontal logo](wec-sim-python-horizontal-readme.svg)
+so its dark navy lettering remains legible in GitHub's light and dark themes.
+The source SVGs remain unchanged. Use the primary logo for square placements
+and the horizontal logo for wide placements; keep their aspect ratios.