📃 Add YAML exercise

slides/exercises/yaml-brief.md

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+## Exercise — Writing YAML
+
+- Produce YAML manifests for dockercoins
+
+  (using the technique of your choice)

slides/exercises/yaml-details.md

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+# Exercise — Writing YAML
+
+- We want to generate YAML manifests for the dockercoins app
+
+- Reminder: it includes 5 Deployments and 4 Services
+
+- Feel free to put everything in a single file, or one file per manifest
+
+- The manifests can be:
+
+  - authored (based on examples found in the Kubernetes docs or online)
+
+  - generated (with `kubectl create ... --dry-run -o yaml` or some web app)
+
+  - dumped (with `kubectl get ... -o yaml`) from existing resources
+
+- Use whatever works best for you!
+
+---
+
+## Goal
+
+- It should be possible to deploy dockercoins by doing:
+  ```bash
+  kubectl create namespace dockercoins
+  kubectl apply --namespace dockercoins -f `...`
+  ```
+
+- Reminder: the argument given to `-f` can be a directory
+
+  (in which case all the YAML files in the directory will be processed)
+
+- Bonus: try to minimize the manifests by removing empty or optional fields
+
+- Compare your manifests with [the ones in the container.training repository][manifests]
+
+[manifests]: https://github.com/jpetazzo/container.training/blob/main/k8s/dockercoins.yaml