Create quickstart.md (#1033)

moving content from readme to dedicated quickstart.md

docs/quickstart.md

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+## Quickstart
+
+Let's see `mariadb-operator`🦭 in action! First of all, install the following configuration manifests that will be referenced by the CRDs further:
+```bash
+kubectl apply -f examples/manifests/config
+```
+
+Next, you can proceed with the installation of a `MariaDB` instance:
+```bash
+kubectl apply -f examples/manifests/mariadb.yaml
+```
+```bash
+kubectl get mariadbs
+NAME      READY   STATUS    PRIMARY POD     AGE
+mariadb   True    Running   mariadb-0       3m57s
+
+kubectl get statefulsets
+NAME      READY   AGE
+mariadb   1/1     2m12s
+
+kubectl get services
+NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)             AGE
+mariadb      ClusterIP   10.96.235.145   <none>        3306/TCP,9104/TCP   2m17s
+```
+Up and running 🚀, we can now create our first logical database and grant access to users:
+```bash
+kubectl apply -f examples/manifests/database.yaml
+kubectl apply -f examples/manifests/user.yaml
+kubectl apply -f examples/manifests/grant.yaml
+```
+```bash
+kubectl get databases
+NAME        READY   STATUS    CHARSET   COLLATE           AGE
+data-test   True    Created   utf8      utf8_general_ci   22s
+
+kubectl get users
+NAME              READY   STATUS    MAXCONNS   AGE
+user              True    Created   20         29s
+
+kubectl get grants
+NAME              READY   STATUS    DATABASE   TABLE   USERNAME          GRANTOPT   AGE
+user              True    Created   *          *       user              true       36s
+```
+At this point, we can run our database initialization scripts:
+```bash
+kubectl apply -f examples/manifests/sqljobs
+```
+```bash
+kubectl get sqljobs
+NAME       COMPLETE   STATUS    MARIADB   AGE
+01-users   True       Success   mariadb   2m47s
+02-repos   True       Success   mariadb   2m47s
+03-stars   True       Success   mariadb   2m47s
+
+kubectl get jobs
+NAME                  COMPLETIONS   DURATION   AGE
+01-users              1/1           10s        3m23s
+02-repos              1/1           11s        3m13s
+03-stars-28067562     1/1           10s        106s
+
+kubectl get cronjobs
+NAME       SCHEDULE      SUSPEND   ACTIVE   LAST SCHEDULE   AGE
+03-stars   */1 * * * *   False     0        57s             2m33s
+```
+
+Now that the database has been initialized, let's take a backup:
+```bash
+kubectl apply -f examples/manifests/backup.yaml
+``` 
+```bash
+kubectl get backups
+NAME               COMPLETE   STATUS    MARIADB   AGE
+backup             True       Success   mariadb   15m
+
+kubectl get jobs
+NAME               COMPLETIONS   DURATION   AGE
+backup-27782894    1/1           4s         3m2s
+```
+Last but not least, let's provision a second `MariaDB` instance bootstrapping from the previous backup:
+```bash
+kubectl apply -f examples/manifests/mariadb_from_backup.yaml
+``` 
+```bash
+kubectl get mariadbs
+NAME                  READY   STATUS    PRIMARY POD             AGE
+mariadb               True    Running   mariadb-0               7m47s
+mariadb-from-backup   True    Running   mariadb-from-backup-0   53s
+
+kubectl get restores
+NAME                                         COMPLETE   STATUS    MARIADB               AGE
+bootstrap-restore-mariadb-from-backup        True       Success   mariadb-from-backup   72s
+
+kubectl get jobs
+NAME                                         COMPLETIONS   DURATION   AGE
+backup                                       1/1           9s         12m
+bootstrap-restore-mariadb-from-backup        1/1           5s         84s
+```