[Documentation]: Fill out supported operators in README

[garrettbyrd]

Description of errors

Currently, the README includes the following table:

There are number of op test, you can run them with: python3 op_tests/test_layernorm2d.py

Ops	Description
GEMM	D=AxB+C
FusedMoE	bf16 balabala
WIP	coming soon...

This should be filled out as operators are added to most accurately reflect was is supported in the software. At the very least, refine what is already present and note that there is more to come.

Maybe do something like the following?

Run operators supported by aiter

Note: aiter is under active development. Supported operators are documented as they are implemented.

Ops	Description
GEMM	$\alpha A B + \beta C$
FusedMoE	bf16 see [1]

[1] FuseMoE: Mixture-of-Experts Transformers for Fleximodal Fusion

Attach any links, screenshots, or additional evidence you think will be helpful.

No response