feat: Update the README and add SECURITY and SUPPORT page

Author: PerfectSlayer

README.md

@@ -1,9 +1,36 @@
+![Datadog logo](https://imgix.datadoghq.com/img/about/presskit/logo-h/dd_horizontal_white.png)
+
 # Datadog Java APM
 
-## Usage
+![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/datadog/dd-trace-java)
+![GitHub all releases](https://img.shields.io/github/downloads/datadog/dd-trace-java/total)
+![GitHub](https://img.shields.io/github/license/datadog/dd-trace-java)
+
+
+This repository contains `dd-trace-java`, Datadog's APM client Java library.
+`dd-trace-java` contains APIs to automatically or manually [trace](https://docs.datadoghq.com/tracing/visualization/#trace) and [profile](https://docs.datadoghq.com/tracing/profiler/) Java applications.
+
+These features power [Distributed Tracing](https://docs.datadoghq.com/tracing/) with [Automatic Instrumentation](https://docs.datadoghq.com/tracing/trace_collection/compatibility/java/#integrations),
+ [Continuous Profiling](https://docs.datadoghq.com/tracing/profiler/),
+ [Error Tracking](https://docs.datadoghq.com/tracing/error_tracking/),
+ [Continuous Integration Visibility](https://docs.datadoghq.com/continuous_integration/),
+ [Deployment Tracking](https://docs.datadoghq.com/tracing/deployment_tracking/),
+ [Code Hotspots](https://docs.datadoghq.com/tracing/profiler/connect_traces_and_profiles/) and more.
+
+## Getting Started
+
+To use and configure, check out the [setup documentation][setup docs].
+
+For advanced usage, check out the [configuration reference][configuration reference] and [custom instrumentation API][api docs].
+
+Confused about the terminology of APM?
+Take a look at the [APM Glossary][visualization docs].
 
-To use and configure Datadog Java APM, see [https://docs.datadoghq.com/tracing/languages/java](https://docs.datadoghq.com/tracing/languages/java)
+[setup docs]: https://docs.datadoghq.com/tracing/languages/java
+[configuration reference]: https://docs.datadoghq.com/tracing/trace_collection/library_config/java
+[api docs]: https://docs.datadoghq.com/tracing/trace_collection/custom_instrumentation/java/
+[visualization docs]: https://docs.datadoghq.com/tracing/visualization/
 
 ## Contributing
 
-See [CONTRIBUTING](CONTRIBUTING.md)
+Before contributing to the project, please take a moment to read our brief [Contribution Guidelines](CONTRIBUTING.md).

SECURITY.md

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+# Security
+
+## Security Vulnerabilities
+
+If you have found a security issue, please contact the security team directly at [email protected].

SUPPORT.md

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+# Support
+
+To get support for the Datadog Java APM, please check [the Datadog support page](https://www.datadoghq.com/support/).