Add EfficientSAM README.md

Author: jakmro

examples/models/efficient_sam/README.md

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+# EfficientSAM Model Export
+
+This example demonstrates how to export the [EfficientSAM](https://github.com/yformer/EfficientSAM) model to Core ML and XNNPACK using ExecuTorch.
+
+# Instructions
+
+## 1. Setup
+
+Follow the [tutorial](https://pytorch.org/executorch/main/getting-started-setup#) to set up ExecuTorch.
+
+## 2. Exports
+
+### Exporting to Core ML
+
+Make sure to install the [required dependencies](https://pytorch.org/executorch/main/build-run-coreml.html#setting-up-your-developer-environment) for Core ML export.
+
+To export the model to Core ML, run the following command:
+
+```bash
+cd executorch
+python -m examples.apple.coreml.scripts.export -m efficient_sam
+```
+
+### Exporting to XNNPACK
+
+To export the model to XNNPACK, run the following command:
+
+```bash
+cd executorch
+python -m examples.xnnpack.aot_compiler -m efficient_sam
+```
+
+# Licensing
+
+The code in the `efficient_sam_core` directory is licensed under the [Apache License 2.0](./efficient_sam_core/LICENSE.txt).