Add some basic doc (#19)

diff --git a/.asf.yaml b/.asf.yaml
index b2b582f..b7b6fc8 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -16,11 +16,12 @@
 #
 
 github:
-  description: Terraform modules for Apache SkyWalking
+  description: Terraform modules and Ansible playbook for Apache SkyWalking
   homepage: https://skywalking.apache.org/
   labels:
     - skywalking
     - terraform
+    - ansible
   enabled_merge_buttons:
     squash:  true
     merge:   false
diff --git a/LICENSE b/LICENSE
index 1429067..92dcac8 100644
--- a/LICENSE
+++ b/LICENSE
@@ -207,21 +207,3 @@
 notices and license terms. Your use of the source code for the these
 subcomponents is subject to the terms and conditions of the following
 licenses.
-
-========================================================================
-Apache 2.0 licenses
-========================================================================
-
-The following components are provided under the Apache License. See project link for details.
-The text of each license is the standard Apache 2.0 license.
-
-   proto files from cncf/udpa: https://github.com/cncf/udpa Apache 2.0
-   proto files from envoyproxy/data-plane-api: https://github.com/envoyproxy/data-plane-api  Apache 2.0
-   proto files from opencensus: https://github.com/census-instrumentation/opencensus-proto/tree/master/gen-go  Apache 2.0
-   proto files from prometheus/client_model: https://github.com/prometheus/client_model Apache 2.0
-   proto files from opentelemetry: https://github.com/open-telemetry/opentelemetry-proto/tree/main/opentelemetry/proto Apache 2.0
-   proto files from opentelemetry: https://github.com/open-telemetry/opentelemetry-proto/tree/v0.7.0 Apache 2.0
-   flatbuffers files from istio/proxy: https://github.com/istio/proxy Apache 2.0
-   mvnw files from https://github.com/apache/maven-wrapper Apache 2.0
-   svg files from skywalking-ui/src/assets/icons: https://github.com/google/material-design-icons Apache 2.0
-   ZipkinQueryHandler.java reference from zipkin2.server.internal.ZipkinQueryApiV2: https://github.com/openzipkin/zipkin  Apache 2.0
diff --git a/NOTICE b/NOTICE
index b2ac175..c68c699 100644
--- a/NOTICE
+++ b/NOTICE
@@ -3,24 +3,3 @@
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
-
------------------------------------------------------------------------
-This product contains code from the Prometheus Project:
-
-Data model artifacts for Prometheus.
-Copyright 2012-2015 The Prometheus Authors
-
-This product includes software developed at
-SoundCloud Ltd. (http://soundcloud.com/).
------------------------------------------------------------------------
-This product contains code from the Apache Maven Wrapper Project:
-
-Apache Maven Wrapper
-Copyright 2013-2022 The Apache Software Foundation
-
-This product includes software developed at
-The Apache Software Foundation (http://www.apache.org/).
-
-The original idea and initial implementation of the maven-wrapper module is derived 
-from the Gradle Wrapper which was written originally by Hans Dockter and Adam Murdoch.
-Copyright 2007 the original author or authors.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ac1303a
--- /dev/null
+++ b/README.md
@@ -0,0 +1,18 @@
+# SkyWalking Terraform and Ansible
+
+This repository contains the Terraform scripts to create the infrastructure for SkyWalking on cloud vendors,
+and the Ansible playbooks to install SkyWalking on the created infrastructure, or on the existing infrastructure,
+no matter on-premises or on cloud vendors, such as AWS.
+
+# Terraform
+
+For now, we have supported the following cloud vendors, and we welcome everyone to contribute supports for
+more cloud vendors:
+
+- Amazon Web Services (AWS): go to the [aws](aws) folder for more details.
+
+# Ansible
+
+You can use the Ansible playbook in combination with the Terraform to create necessary infrastructure and install
+SkyWalking on the created infrastructure, or you can use the Ansible to install SkyWalking on the existing infrastructure.
+The Ansible playbook and documentation about how to use it can be found in the [ansible](ansible) folder.