chore: Add citation files

CITATION.bib

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+@article{yang2021real,
+  title     = {Real-time Semantic Segmentation with Context Aggregation Network},
+  author    = {Yang, Michael Ying and Kumaar, Saumya and Lyu, Ye and Nex, Francesco},
+  journal   = {ISPRS Journal of Photogrammetry and Remote Sensing},
+  volume    = {178},
+  pages     = {124--134},
+  year      = {2021},
+  issn      = {0924-2716},
+  doi       = {10.1016/j.isprsjprs.2021.06.006},
+  url       = {https://www.sciencedirect.com/science/article/pii/S0924271621001647},
+  keywords  = {Semantic segmentation, Real-time, Convolutional neural network, Context aggregation network}
+}
+
+@inproceedings{kumaar2021cabinet,
+  title     = {{CABiNet}: Efficient Context Aggregation Network for Low-Latency Semantic Segmentation},
+  author    = {Kumaar, Saumya and Lyu, Ye and Nex, Francesco and Yang, Michael Ying},
+  booktitle = {2021 IEEE International Conference on Robotics and Automation (ICRA)},
+  pages     = {13517--13524},
+  year      = {2021},
+  doi       = {10.1109/ICRA48506.2021.9560977}
+}

CITATION.cff

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+cff-version: 1.2.0
+message: "If you find this work helpful, please consider citing our papers."
+authors:
+  - family-names: Kumaar
+    given-names: Saumya
+    orcid: https://orcid.org/0000-0003-2213-8265
+  - family-names: Lyu
+    given-names: Ye
+  - family-names: Nex
+    given-names: Francesco
+  - family-names: Yang
+    given-names: Michael Ying
+
+preferred-citation:
+  type: article-journal
+  title: "Real-time Semantic Segmentation with Context Aggregation Network"
+  journal: "ISPRS Journal of Photogrammetry and Remote Sensing"
+  volume: 178
+  pages: "124-134"
+  year: 2021
+  doi: "10.1016/j.isprsjprs.2021.06.006"
+  issn: "0924-2716"
+  url: "https://www.sciencedirect.com/science/article/pii/S0924271621001647"
+  keywords:
+    - "Semantic segmentation"
+    - "Real-time"
+    - "Convolutional neural network"
+    - "Context aggregation network"
+
+references:
+  - type: paper-conference
+    title: "CABiNet: Efficient Context Aggregation Network for Low-Latency Semantic Segmentation"
+    authors:
+      - family-names: Kumaar
+        given-names: Saumya
+        orcid: https://orcid.org/0000-0003-2213-8265
+      - family-names: Lyu
+        given-names: Ye
+      - family-names: Nex
+        given-names: Francesco
+      - family-names: Yang
+        given-names: Michael Ying
+    container-title: "2021 IEEE International Conference on Robotics and Automation (ICRA)"
+    year: 2021
+    pages: "13517-13524"
+    doi: "10.1109/ICRA48506.2021.9560977"