update readme with sam model and encoders

Author: Rustem Galiullin

README.md

@@ -94,6 +94,7 @@ Congratulations! You are done! Now you can train your model with your favorite f
  - PAN [[paper](https://arxiv.org/abs/1805.10180)] [[docs](https://smp.readthedocs.io/en/latest/models.html#pan)]
  - DeepLabV3 [[paper](https://arxiv.org/abs/1706.05587)] [[docs](https://smp.readthedocs.io/en/latest/models.html#deeplabv3)]
  - DeepLabV3+ [[paper](https://arxiv.org/abs/1802.02611)] [[docs](https://smp.readthedocs.io/en/latest/models.html#id9)]
+ - SAM [[paper](https://ai.facebook.com/research/publications/segment-anything/)] [[docs](https://github.com/facebookresearch/segment-anything)]
 
 #### Encoders <a name="encoders"></a>
 
@@ -394,6 +395,19 @@ Note: In the official github repo the s0 variant has additional num_conv_branche
 </div>
 </details>
 
+<details>
+<summary style="margin-left: 25px;">SAM</summary>
+<div style="margin-left: 25px;">
+
+| Encoder   | Weights  | Params, M |
+|-----------|:--------:|:---------:|
+| sam-vit_b |  sa-1b   |    91M    |
+| sam-vit_l |  sa-1b   |   308M    |
+| sam-vit_h |  sa-1b   |   636M    |
+
+</div>
+</details>
+
 
 \* `ssl`, `swsl` - semi-supervised and weakly-supervised learning on ImageNet ([repo](https://github.com/facebookresearch/semi-supervised-ImageNet1K-models)).