docs: add documentation for the feature for the website (#71)

Summary: Pull Request resolved: #71

Reviewed By: bigfootjon

Differential Revision: D77396094

Pulled By: sdwilsh

fbshipit-source-id: 7a5cf237f414272b160a0c88817dcf5edb92e624

Author: sdwilsh

devcontainer-features/src/dotslash/README.md

@@ -2,6 +2,8 @@
 
 A feature to install DotSlash into a Dev Container.
 
+It is installed at `/usr/local/bin/dotslash`.
+
 ## Example Usage
 
 ```json

website/docs/installation.md

@@ -63,6 +63,17 @@ xattr -r -d com.apple.quarantine ~/Downloads/dotslash-macos.*.tar.gz
 cmd /c 'curl.exe -LSfs https://github.com/facebook/dotslash/releases/latest/download/dotslash-windows.tar.gz | tar fxz - -C YOUR_BIN_PATH'
 ```
 
+## Developer Container
+
+We provide a feature that you can add to your `devcontainer.json` that will
+automatically install the latest version of DotSlash to `/usr/local/bin`.
+
+```json
+"features": {
+  "ghcr.io/facebook/devcontainers/features/dotslash:latest": {}
+}
+```
+
 ## GitHub Actions
 
 We provide a GitHub Action to install dotslash for a workflow: