Add usage part

Author: fscholdei

README.md

@@ -9,6 +9,10 @@
 
 Provides SCM-Manager metrics as json.
 
+## Usage
+
+Find out how this plugin can be used on the [user documentation page](https://scm-manager.org/plugins/scm-metrics-json-plugin/docs).
+
 ## Build and testing
 
 The plugin can be compiled and packaged with the normal maven lifecycle:
@@ -30,7 +34,7 @@ If the plugin was started with `gradle run`, the default browser of the os shoul
 If the browser does not start automatically, start it manually and go to [http://localhost:8081/scm](http://localhost:8081/scm).
 
 In this mode each change to web files (src/main/js or src/main/webapp), should trigger reload of the browser with the made changes.
-If you compile a class (e.g.: with your IDE from src/main/java to target/classes),
+If you compile a class (e.g.: with your IDE from src/main/java to target/classes), 
 the SCM-Manager context will restart automatically. So you can see your changes without restarting the server.
 
 ## Directory & File structure
@@ -54,7 +58,7 @@ A quick look at the files and directories you'll see in a SCM-Manager project.
  ├── CHANGELOG.md
  ├── gradle.properties
  ├── gradlew
- ├── LICENSE
+ ├── LICENSE.txt
  ├── package.json
  ├── README.md
  ├── settings.gradle
@@ -64,15 +68,15 @@ A quick look at the files and directories you'll see in a SCM-Manager project.
 1. **`node_modules/`**: This directory contains all modules of code that your project depends on (npm packages) are automatically installed.
 
 2. **`src/`**: This directory will contain all code related to what you see or not. `src` is a convention for “source code”.
- 1. **`main/`**
- 1. **`java/`**: This directory contains the Java code.
- 2. **`js/`**: This directory contains the JavaScript code for the web ui, inclusive unit tests: suffixed with `.test.ts`
- 3. **`resources/`**: This directory contains the classpath resources.
- 2. **`test/`**
- 1. **`java/`**: This directory contains the Java unit tests.
- 3. **`resources/`**: This directory contains classpath resources for unit tests.
- 3. **`target/`**: This is the build directory.
-
+  1. **`main/`**
+  1. **`java/`**: This directory contains the Java code.
+  2. **`js/`**: This directory contains the JavaScript code for the web ui, inclusive unit tests: suffixed with `.test.ts`
+  3. **`resources/`**: This directory contains the classpath resources.
+  2. **`test/`**
+  1. **`java/`**: This directory contains the Java unit tests.
+  3. **`resources/`**: This directory contains classpath resources for unit tests.
+  3. **`target/`**: This is the build directory.
+ 
 3. **`.editorconfig`**: This is a configuration file for your editor using [EditorConfig](https://editorconfig.org/). The file specifies a style that IDEs use for code.
 
 4. **`.gitignore`**: This file tells git which files it should not track / not maintain a version history for.
@@ -85,12 +89,12 @@ A quick look at the files and directories you'll see in a SCM-Manager project.
 
 8. **`gradlew`**: Bundled gradle wrapper if you don`t have gradle installed.
 
-9. **`LICENSE`**: This project is licensed under the MIT license.
+9. **`LICENSE.txt`**: This project is licensed under the MIT license.
 
 10. **`package.json`**: Here you can find the dependency/build configuration and dependencies for the frontend.
 
 11. **`README.md`**: This file, containing useful reference information about the project.
-
+ 
 12. **`settings.gradle`**: Gradle settings configuration.
 
 13. **`tsconfig.json`** This is the typescript configuration file.