Add README

README.md

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+# Lowlighting
+[![Jetbrains Plugin](https://img.shields.io/jetbrains/plugin/v/15206-lowlighting.svg)](https://plugins.jetbrains.com/plugin/15206-lowlighting)
+[![Downloads](https://img.shields.io/jetbrains/plugin/d/15206-lowlighting.svg)](https://plugins.jetbrains.com/plugin/15206-lowlighting)
+[![Rating](https://img.shields.io/jetbrains/plugin/r/rating/15206-lowlighting.svg)](https://plugins.jetbrains.com/plugin/15206-lowlighting)
+
+A plugin for IntelliJ IDEA and Android Studio.
+
+Lowlights all calls to functions annotated with a custom annotation and allows
+folding of all such calls at once.
+
+<img src="images/lowlighting.png" />
+
+## Usage
+
+1) Declare an annotation. Can be declared either in Java or Kotlin.
+    ```kotlin
+    package com.playground.analytics
+
+    @Retention(value = AnnotationRetention.SOURCE)
+    annotation class Lowlight
+    ```
+
+2) Create a `.lowlighting` file in the root directory and add the fully qualified name of the annotation.
+    ```text
+    com.playground.analytics.Lowlight
+    ```
+
+3) Annotate a function with the annotation.
+    ```kotlin
+    @Lowlight
+    fun logEvent(
+        firebaseEventName: String? = null,
+        firebaseParameterName: String? = null,
+        firebaseParameterValue: String? = null,
+        firebaseParameterMap: Map<String, String?>? = null,
+    )
+    ```
+
+4) All invocations of the annotated function will be lowlighted.
+
+## Installation
+
+1) Access the Plugins page in IDE settings
+  * On Windows:
+    - `File` >
+     `Settings` (<kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>S</kbd>) >
+     `Plugins`
+  * On MacOs:
+    - `Preferences` (<kbd>⌘</kbd> <kbd>,</kbd>) >
+      `Plugins`
+
+2) Install plugin
+  - Conveniently from within IDE:
+    - `Plugins` >
+      `Marketplace` >
+      `Search for "Lowlighting"` >
+      `Install`
+  - Or download the [latest release](https://plugins.jetbrains.com/plugin/15206-lowlighting) and install it manually using:
+    - `Plugins` >
+      `⚙️` >
+      `Install plugin from disk...`
+
+
+## License
+[Apache License 2.0](https://choosealicense.com/licenses/apache-2.0/)