add slack channel to readme #3261

Job	Run time
gather-models-cpu	12s
gather-models-gpu	11s
test-gguf-util (macos-14)	4m 15s
test-mps (macos-m1-stable)	2m 8s
test-mps-dtype (macos-m1-stable)	2m 44s
torchchat-command-load-test (macos-14)	1m 52s
compile-gguf (macos-14)	4m 7s
runner-aoti (16-core-ubuntu)	6m 15s
runner-et (16-core-ubuntu)	7m 52s
runner-aoti (macos-14-xlarge)	3m 44s
runner-et (macos-14-xlarge)	8m 4s
test-tinystories-executorch (16-core-ubuntu)	18m 16s
test-torchao-experimental (macos-14-xlarge)	13m 5s
test-tinystories-executorch (macos-14-xlarge)	15m 40s
test-build-runner-et-android / linux-job	12m 41s
test-gpu-aoti-float32 (cuda, stories15M) / linux-job	14m 28s
test-gpu-compile (cuda, stories15M) / linux-job	24m 56s
test-gpu-aoti-float16 (cuda, stories15M) / linux-job	13m 55s
test-gpu-eval-sanity-check (cuda, stories15M) / linux-job	12m 57s
test-gpu-aoti-bfloat16 (cuda, stories15M) / linux-job	15m 11s
test-cpu-aoti (x86_64, stories15M)	19m 46s
test-cpu-aoti (aarch64, stories15M)	10m 19s
test-cpu-compile (x86_64, stories15M)	17m 4s
test-cpu-compile (aarch64, stories15M)	9m 10s
test-cpu-eval-sanity-check (x86_64, stories15M)	10m 46s
test-cpu-eval-sanity-check (aarch64, stories15M)	8m 30s
test-cpu-eval-sanity-check-float16 (x86_64, stories15M)	30m 27s
test-cpu-eval-sanity-check-float32 (x86_64, stories15M)	38m 46s
test-cpu-eval-sanity-check-float16 (aarch64, stories15M)	6m 36s
test-cpu-eval-sanity-check-float32 (aarch64, stories15M)	10m 37s
	5h 44m 34s

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