Doc update for release 2.0RC1

Author: etienne-sf

Diff for: CHANGELOG.md

@@ -9,6 +9,25 @@ Whether the application uses the _graphql_, the _generateClientCode_ or the _gen
 * skipGenerationIfSchemaHasNotChanged: true _(both client and server mode)_
 
 
+# 2.0RC1
+
+Release Candidate version for the 2.x versions.
+
+Main changes:
+* Based on [spring-graphql](https://spring.io/projects/spring-graphql)
+* Upgrade of dependencies, based on [spring-boot 2.7.10](https://docs.spring.io/spring-boot/docs/2.7.10/reference/html/)
+* Needs JDK 17 to be build, but the generated artifact is compatible with Java 8
+* Compatibility with Spring Boot 3.
+    * For a sample of this, you can check the [graphql-maven-plugin-samples-Forum-client](https://github.com/graphql-java-generator/graphql-maven-plugin-project/tree/master_2.x/graphql-maven-plugin-samples/graphql-maven-plugin-samples-Forum-client) and the [graphql-maven-plugin-samples-Forum-server](https://github.com/graphql-java-generator/graphql-maven-plugin-project/tree/master_2.x/graphql-maven-plugin-samples/graphql-maven-plugin-samples-Forum-server) samples that are part of the build.
+
+You can check these pages for more information on how to migrate from 1.x versions:
+* [[Client migration from 1.x to 2.x|client_migrate_1-x_to_2-x]]
+* [[Server migration from 1.x to 2.x|server_migrate_1-x_to_2-x]]
+
+Know issues:
+* All builds for servers should be executed with a clean (_mvn clean install_ or _gradlew clean build_), otherwise the GraphQL schema available at runtime becomes invalid. The server won't start.
+* For Spring 3, in client mode, copyRuntimeSources should be manually to false, to avoid compilation errors
+
 # 1.18.11
 
 Both modes: