docs: link to user docs (#1594)

Signed-off-by: Alex Chi <[email protected]>

CONTRIBUTING.md

@@ -1,6 +1,7 @@
 # Develop RisingWave
 
 - [Develop RisingWave](#develop-risingwave)
+  - [Communication](#communication)
   - [Setting Up Development Environment](#setting-up-development-environment)
   - [Code Structure](#code-structure)
   - [Start and Monitor a Dev Cluster](#start-and-monitor-a-dev-cluster)
@@ -23,6 +24,7 @@
   - [Sending a PR](#sending-a-pr)
     - [Pull Request Title](#pull-request-title)
     - [Pull Request Description](#pull-request-description)
+    - [CLA](#cla)
   - [Update CI Workflow](#update-ci-workflow)
   - [When adding new files...](#when-adding-new-files)
   - [When adding new dependencies...](#when-adding-new-dependencies)
@@ -31,6 +33,10 @@ Thanks for your interest in contributing to RisingWave! Contributions of many ki
 
 If you have questions, please [create a Github issue](https://github.com/singularity-data/risingwave/issues/new/choose).
 
+## Communication
+
+RisingWave community is available on Slack. Please use the [invitation link](https://join.slack.com/t/risingwave-community/shared_invite/zt-120rft0mr-d8uGk3d~NZiZAQWPnElOfw) to join.
+
 ## Setting Up Development Environment
 
 To contribute to RisingWave, the first thing is to set up the development environment. You'll need:
@@ -321,6 +327,10 @@ You may also check out our previous PRs in the [PR list](https://github.com/sing
 - If your PR is small (such as a typo fix), you can go brief.
 - If it is large and you have changed a lot, it's better to write more details.
 
+### CLA
+
+Contributors will need to sign Singularity Data's CLA.
+
 ## Update CI Workflow
 
 We use scripts to generate GitHub Action configurations based on templates in `.github/workflow-template`.

README.md

@@ -4,6 +4,12 @@
 [![CI](https://github.com/singularity-data/risingwave/actions/workflows/main.yml/badge.svg)](https://github.com/singularity-data/risingwave/actions/workflows/main.yml)
 [![codecov](https://codecov.io/gh/singularity-data/risingwave/branch/main/graph/badge.svg?token=EB44K9K38B)](https://codecov.io/gh/singularity-data/risingwave)
 
+RisingWave is a cloud-native streaming database that uses SQL as the interface language. It is designed to reduce the complexity and cost of developing and using a stream processing platform so that developers can build applications more efficiently. It ingests streaming data, performs the processing that you specify (aggregates, joins, maps, enrichment, etc.), and dynamically updates the results. As a streaming database, RisingWave stores the results so that users can access them in real-time.
+
+RisingWave ingests data from sources like Kafka, Apache Pulsar, Amazon Kinesis, Redpanda, and materialized CDC sources.
+
+Learn more in [Introduction to RisingWave](https://singularity-data.com/risingwave-docs/docs/latest/intro/).
+
 ## Quick Start
 
 ### Installation
@@ -66,6 +72,10 @@ If everything works, you will see
 
 in the Postgres shell.
 
+## Documentation
+
+You may refer to [RisingWave Docs](https://singularity-data.com/risingwave-docs/) for more information, such as architecture overview, how to create streaming source, etc.
+
 ## License
 
 RisingWave is under the Apache 2.0 license. See the [LICENSE](LICENSE) file for details.