Add the application plugin to the otlp example (#361)

Author: jkwatson

otlp/README.md

@@ -0,0 +1,14 @@
+### Running the OTLP example
+
+Assuming you're on a unix-alike (mac, linux, etc):
+
+In a shell:
+```shell
+cd docker
+docker-compose up
+```
+
+In a separate shell:
+```shell
+../gradlew run
+```

otlp/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     id("java")
+    id("application")
 }
 
 description = "OpenTelemetry Example for OTLP Exporters"
@@ -11,6 +12,10 @@ java {
     }
 }
 
+application {
+    mainClass = "io.opentelemetry.example.otlp.OtlpExporterExample"
+}
+
 dependencies {
     implementation("io.opentelemetry:opentelemetry-api")
     implementation("io.opentelemetry:opentelemetry-sdk")