Add CHANGELOG, CONTRIBUTING, LICENSE, and gitignore.

Author: kinyoklion

.gitignore

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+# Eclipse project files
+.classpath
+.project
+.settings
+
+# Intellij project files
+*.iml
+*.ipr
+*.iws
+.idea/
+ 
+#Gradle
+.gradletasknamecache
+.gradle/
+build/
+bin/
+out/
+classes/

CHANGELOG.md

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+# Contributing to the LaunchDarkly OpenFeature provider for the Server-Side SDK for Java
+ 
+LaunchDarkly has published an [SDK contributor's guide](https://docs.launchdarkly.com/sdk/concepts/contributors-guide) that provides a detailed explanation of how our SDKs work. See below for additional information on how to contribute to this SDK.
+ 
+## Submitting bug reports and feature requests
+ 
+The LaunchDarkly SDK team monitors the [issue tracker](https://github.com/launchdarkly/openfeature-java-server/issues) in the provider repository. Bug reports and feature requests specific to this provider should be filed in this issue tracker. The SDK team will respond to all newly filed issues within two business days.
+ 
+## Submitting pull requests
+ 
+We encourage pull requests and other contributions from the community. Before submitting pull requests, ensure that all temporary or unintended code is removed. Don't worry about adding reviewers to the pull request; the LaunchDarkly SDK team will add themselves. The SDK team will acknowledge all pull requests within two business days.
+ 
+## Build instructions
+ 
+### Prerequisites
+ 
+The provider builds with [Gradle](https://gradle.org/) and should be built against Java 8.
+
+### Building
+
+To build the provider without running any tests:
+```
+./gradlew jar
+```
+
+If you wish to clean your working directory between builds, you can clean it by running:
+```
+./gradlew clean
+```
+
+If you wish to use your generated provider artifact by another Maven/Gradle project, you will likely want to publish the artifact to your local Maven repository so that your other project can access it.
+```
+./gradlew publishToMavenLocal
+```
+
+### Testing
+ 
+To build the provider and run all unit tests:
+```
+./gradlew test
+```

CONTRIBUTING.md

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+Copyright 2023 Catamorphic, Co.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.