Add quick start documentation

Closes #2256

README.md

@@ -28,6 +28,25 @@
 - Executable jar
 - Allows extension with custom rule sets and reporters
 
+## Quick start
+
+Follow steps below for a quick start with latest ktlint release.
+
+* Step 1: Install with brew
+  ```shell
+  brew install ktlint
+  ```
+  See [download and verification from GitHub](https://pinterest.github.io/ktlint/latest/install/cli/#download-and-verification) or [other package managers](https://pinterest.github.io/ktlint/latest/install/cli/#package-managers) for alternative ways of installing ktlint. Or, use one of the [integrations like maven and gradle plugins](https://pinterest.github.io/ktlint/latest/install/integrations/).
+
+* Step 2: Lint and format your code  
+  All files with extension `.kt` and `.kts` in the current directory and below will be scanned. Problems will be fixed automatically when possible.
+  ```shell title="Autocorrect style violations"
+  ktlint --format
+  # or
+  ktlint -F
+  ```
+  See [cli usage](https://pinterest.github.io/ktlint/latest/install/cli/#command-line-usage) for a more extensive description on using ktlint.
+
 ## Documentation
 
 <a href="https://pinterest.github.io/ktlint/">User guide</a>

documentation/release-latest/docs/quick-start.md

@@ -0,0 +1,16 @@
+Follow steps below for a quick start with latest ktlint release.
+
+## Step 1: Install with brew
+```shell
+brew install ktlint
+```
+See [download and verification from GitHub](../install/cli/#download-and-verification) or [other package managers](../install/cli/#package-managers) for alternative ways of installing ktlint. Or, use one of the [integrations like maven and gradle plugins](../install/integrations/).
+
+## Step 2: Lint and format your code
+All files with extension `.kt` and `.kts` in the current directory and below will be scanned. Problems will be fixed automatically when possible.
+```shell title="Autocorrect style violations"
+ktlint --format
+# or
+ktlint -F
+```
+See [cli usage](../install/cli/#command-line-usage) for a more extensive description on using ktlint.

documentation/release-latest/mkdocs.yml

@@ -38,7 +38,9 @@ theme:
     - search.share
 
 nav:
-  - Home: index.md
+  - Home:
+    - Features: index.md
+    - Quick start: quick-start.md
   - Installation:
     - Command line: install/cli.md
     - Integrations: install/integrations.md

documentation/snapshot/docs/quick-start.md

@@ -0,0 +1,16 @@
+Follow steps below for a quick start with latest ktlint release.
+
+## Step 1: Install with brew
+```shell
+brew install ktlint
+```
+See [download and verification from GitHub](../install/cli/#download-and-verification) or [other package managers](../install/cli/#package-managers) for alternative ways of installing ktlint. Or, use one of the [integrations like maven and gradle plugins](../install/integrations/).
+
+## Step 2: Lint and format your code
+All files with extension `.kt` and `.kts` in the current directory and below will be scanned. Problems will be fixed automatically when possible.
+```shell title="Autocorrect style violations"
+ktlint --format
+# or
+ktlint -F
+```
+See [cli usage](../install/cli/#command-line-usage) for a more extensive description on using ktlint.

documentation/snapshot/mkdocs.yml

@@ -38,7 +38,9 @@ theme:
     - search.share
 
 nav:
-  - Home: index.md
+  - Home:
+      - Features: index.md
+      - Quick start: quick-start.md
   - Installation:
     - Command line: install/cli.md
     - Integrations: install/integrations.md