Add content for pre-trained models (#7370)

* Update pre-trained-models

* Update src/data/roadmaps/ai-engineer/content/pre-trained-models@d7fzv_ft12EopsQdmEsel.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/ai-engineer/content/pre-trained-models@d7fzv_ft12EopsQdmEsel.md

@@ -1 +1,7 @@
-# Pre-trained Models
+# Pre-trained Models
+
+Pre-trained models are Machine Learning (ML) models that have been previously trained on a large dataset to solve a specific task or set of tasks. These models learn patterns, features, and representations from the training data, which can then be fine-tuned or adapted for other related tasks. Pre-training provides a good starting point, reducing the amount of data and computation required to train a new model from scratch.
+
+Visit the following resources to learn more:
+
+- [@article@Pre-trained models: Past, present and future](https://www.sciencedirect.com/science/article/pii/S2666651021000231)