Add FLUX e2e example

examples/diffusion/python_flux/README.md

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+## Setup
+
+Make sure python interpreter can find migraphx. Default location:
+```
+export PYTHONPATH=/opt/rocm/lib:$PYTHONPATH
+```
+
+Install dependencies
+```
+pip install -r torch_requirements.txt -r requirements.txt
+```
+
+Login to Huggingface:
+```
+huggingface-cli login
+```
+
+## Generate Image
+```
+python3 txt2img.py -p "A cat holding a sign that says hello world" -o ./
+```
+
+## Benchmark
+Ex. 10 full executions:
+```
+python3 txt2img.py -b 10 --fp16
+```