Note more Feedback channels on the site (#149)

docs/feedback.md

@@ -4,13 +4,27 @@ While Declarative Gradle is in early stages, you can explore the project samples
 Check out the [Getting Started Guide](./getting-started/README.md) tfor the pointer.
 Initial feedback on the DSL, early demos, features and use-cases will be appreciated!
 
+## Slack
+
+We have a `#declarative-gradle` channel on the [Gradle Community Slack](https://community.gradle.org/contributing/community-slack/).
+It is a main discussion channel for the feature and for Q&A.
+
+If you are a Kotlin user, there is also a `#gradle` channel on the [Kotlin Foundation Slack](https://community.gradle.org/contributing/community-slack/).
+
+## GitHub Issues
+
+For any bug report or feature request,
+feel free to use the [GitHub Issues](https://github.com/gradle/declarative-gradle/issues) in our dedicated Declarative Gradle repository.
+Later, we may move them into the main Gradle repository.
+
 ## Feedback Form
 
 If the form below does not load,
 use [this link](https://docs.google.com/forms/d/e/1FAIpQLSefobpybAJK-C1ADdAvhlvf8egvdMzxIi_sGVDKa4G26MfTcg/viewform)
 
 <iframe src="https://docs.google.com/forms/d/e/1FAIpQLSefobpybAJK-C1ADdAvhlvf8egvdMzxIi_sGVDKa4G26MfTcg/viewform?embedded=true" width="100%" height="2345" frameborder="0" marginheight="0" marginwidth="0">Loading…</iframe>
 
-## Other Feedback Channels
+## Spread the Word!
 
-- `#declarative-gradle` channel on the [Gradle Community Slack](https://gradle.org/slack-invite)
+Of course, sharing about Declarative Gradle on social media will be appreciated!
+Make sure to tag our [official accounts](https://community.gradle.org/contributing/spread-the-word/#social-media) so that we can repost!