Added citations

README.md

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+## Citations & References
+
+**Backbone architectures:**
+- EfficientNetV2: [EfficientNetV2: Smaller Models and Faster Training](https://arxiv.org/abs/2104.00298) (Mingxing Tan, Quoc V. Le. ICML 2021)
+- MobileNetV3: [Searching for MobileNetV3](https://arxiv.org/abs/1905.02244) (Andrew Howard et al. ICCV 2019)
+- ConvNeXt: [A ConvNet for the 2020s](https://arxiv.org/abs/2201.03545) (Zhuang Liu et al. CVPR 2022)
+
+**Output heads architectures:**
+_Not directly implemented, but inspired by:_  
+- FCN: [Fully Convolutional Networks for Semantic Segmentation](https://arxiv.org/abs/1411.4038) (Jonathan Long, Evan Shelhamer, Trevor Darrell. CVPR 2015)
+- U-Net: [U-Net: Convolutional Networks for Biomedical Image Segmentation](https://arxiv.org/abs/1505.04597) (Olaf Ronneberger, Philipp Fischer, Thomas Brox. MICCAI 2015)
+
+---
+
 ## Contact
 
 For questions reach out via GitHub (Kev-HL).