Add Frequently Asked Questions (FAQ) (#209)

* Add FAQ

Signed-off-by: hmsayem <[email protected]>

* Update FAQ

Signed-off-by: hmsayem <[email protected]>

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

docs/FAQ/README.md

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+---
+title: FAQ | Stash  
+menu:
+  docs_{{ .version }}:
+    identifier: faq-readme
+    name: README
+    parent: faq
+    weight: -1
+product_name: stash
+menu_name: docs_{{ .version }}
+section_menu_id: faq
+url: /docs/{{ .version }}/faq/
+aliases:
+  - /docs/{{ .version }}/faq/README/
+---
+
+# Frequently Asked Questions
+
+## How to temporarily pause a backup?
+
+### Pause Backup
+
+Run the following commands to pasue a backup temporarily,
+
+```bash
+# pause backup by patching BackupConfiguration
+❯ kubectl patch backupconfiguration -n <namespace> <backupconfiguration name> --type="merge" --patch='{"spec": {"paused": true}}'
+
+# pause backup using Stash `kubectl` plugin 
+❯ kubectl stash pause backup -n demo --backupconfig=<backupconfiguration name>
+```
+
+### Resume Backup
+
+Similarly you can also resume a paused backup. Run the following commands to resume a backup,
+
+```bash
+# resume backup by patching BackupConfiguration
+kubectl patch backupconfiguration -n <namespace> <backupconfiguration name> --type="merge" --patch='{"spec": {"paused": false}}'
+
+# resume backup using Stash `kubectl` plugin
+❯ kubectl stash resume backup -n demo --backupconfig=<backupconfiguration name>
+```
+
+## When `retentionPolicy` is applied?
+
+`retentionPolicy` specifies the policy to follow for cleaning old snapshots. Stash removes any snapshot from backend that falls outside the scope of the policy. When a `BackupSession` is completed, Stash checks for outdated snapshots according to the `retentionPolicy` and remove them. If you use the policy `keep-last-5`, Stash will remove any snapshot that is older than the most recent 5 snapshots. 
+
+## Do I need to delete the init containers after recovery?
+
+You don't need to delete the init containers after recovery.  If your workload restarts with the `stash-init` init-container for any reason, the init-container will skip running restore process if there is no pending RestoreSession for this workload. If you delete the RestoreSession, Stash will remove the `init-container` automatically. Beware that it will cause your workload to restart.
+
+## Need More Help?
+
+To speak with us, please leave a message on [our website](https://appscode.com/contact/).
+
+To join public discussions with the Stash community, join us in the [AppsCode Slack team](https://appscode.slack.com/messages/C8NCX6N23/details/) channel `#stash`. To sign up, use our [Slack inviter](https://slack.appscode.com/).

docs/FAQ/_index.md

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+---
+title: FAQ
+description: FAQ | Stash
+menu:
+  docs_{{ .version }}:
+    identifier: faq
+    name: FAQ
+    weight: 1250
+menu_name: docs_{{ .version }}
+---