Add some docs

Author: jkwatson

README.md

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+## Gradle OpenTelemetry Build Tracing Plugin
+This plugin will trace your gradle build using OpenTelemetry APIs. 
+
+## Usage 
+
+### kotlin buildscript (`build.gradle.kts`/`settings.gradle.kts`):
+
+In your `settings.gradle.kts` file, configure your plugins like this:
+
+```kotlin
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        maven(url="https://jitpack.io")
+    }
+    plugins {
+        # ...
+        id("com.github.jkwatson.gradle-otel-tracing") version "0.0.2"
+    }
+}
+
+```
+
+And, in your `build.gradle.kts` apply the plugin like this:
+
+```kotlin
+plugins {
+    # ...
+    id("com.github.jkwatson.gradle-otel-tracing")
+}
+```
+
+### groovy buildscript (`build.gradle`/`settings.gradle`):
+
+In your `settings.gradle` file, configure your plugins like this:
+
+```groovy
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        maven {
+            url = "https://jitpack.io"
+        }
+    }
+    plugins {
+        # ...
+        id "com.github.jkwatson.gradle-otel-tracing" version "0.0.2"
+    }
+}
+```
+
+And, in your `build.gradle` apply the plugin like this:
+
+```groovy
+plugins {
+    # ...
+    id "com.github.jkwatson.gradle-otel-tracing"
+}
+```
+
+## Configuration
+Configuration of the OpenTelemetry SDK is done via the OpenTelemetry Java autoconfiguration module. 
+
+Documentation can be found here: https://github.com/open-telemetry/opentelemetry-java/tree/main/sdk-extensions/autoconfigure
+
+This plugin will use the name of your project as the OpenTelemetry `service.name` Resource attribute.