Add README.md for example jobs.

example/README.md

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+Example jobs
+======
+
+## Redis Server
+
+```
+$ nomad job run redis.nomad
+```
+will start a `redis` server using `nomad-driver-containerd`
+
+### Exec into redis container
+
+```
+$ nomad job status redis
+```
+Copy the allocation ID from the output of `nomad job status` command.
+
+```
+$ nomad alloc exec -i -t <allocation_id> /bin/sh
+```
+
+## Signal Handler
+
+```
+$ nomad job run signal.nomad
+```
+will start the signal handler container. You can send any signal
+[(from a list of supported signals)](https://github.com/hashicorp/consul-template/blob/master/signals/signals_unix.go)
+to this container and it will print the signal on `stdout` for you.
+
+```
+$ nomad job status signal
+```
+Copy the allocation ID from the output of `nomad job status` command.
+
+```
+$ nomad alloc signal -s <signal> <allocation_id>
+```
+
+## Stress
+
+```
+$ nomad job run stress.nomad
+```
+will start a stress test container. This container is based on linux `stress-ng` tool which is used for generating
+heavy load on CPU and memory to do stress testing.
+
+This container executes the following command as an entrypoint to the container:
+```
+stress-ng --cpu 4 --io 4 --vm 4 --vm-bytes 256M --fork 4 --timeout 180s
+```
+The above command will run stress tests for 3 minutes (180 secs).
+
+```
+$ nomad job status stress
+```
+Copy the allocation ID from the output of `nomad job status` command.
+
+While the container is running, you can check the stats using:
+```
+$ nomad alloc status -stats <allocation_id>
+```