[CHANGE] add readme for "bitwarden-secrets-manager"

Author: RouL

src/bitwarden-secrets-manager/README.md

@@ -0,0 +1,26 @@
+
+# Bitwarden Secrets Manager CLI (bws) (bitwarden-secrets-manager)
+
+Installs the bitwarden secrets manager CLI (bws) and optionally configures it to use a self-hosted server.
+
+## Example Usage
+
+```json
+"features": {
+    "ghcr.io/RouL/devcontainer-features/bitwarden-secrets-manager:1": {}
+}
+```
+
+## Options
+
+| Options Id | Description | Type | Default Value |
+|-----|-----|-----|-----|
+| server_base | Provides the base URL of your Bitwarden server, if you host your own server. | string | - |
+| server_api | Provides an API URL that differs from the default (if in doubt, leave it empty!). | string | - |
+| server_identity | Provides an identity URL that differs from the default (if in doubt, leave it empty!). | string | - |
+
+
+
+---
+
+_Note: This file was auto-generated from the [devcontainer-feature.json](devcontainer-feature.json).  Add additional notes to a `NOTES.md`._