GH-116: Document optional dependencies

Fixes #116

Author: artembilan

README.md

@@ -38,6 +38,19 @@ where the topic is an *SQS* Queue.
 
 [Pull requests][] are welcome. Please see the [contributor guidelines][] for details. Additionally, if you are contributing, we recommend following the process for Spring Integration as outlined in the [administrator guidelines][].
 
+# Dependency Management
+
+These dependencies are optional in the project:
+
+* `org.springframework.cloud:spring-cloud-aws-messaging` - for SQS and SNS channel adapters
+* `org.springframework.integration:spring-integration-file` - for S3 channel adapters
+* `org.springframework.integration:spring-integration-http` - for SNS inbound channel adapter
+* `compile('com.amazonaws:aws-java-sdk-kinesis` - for Kinesis channel adapters
+* `com.amazonaws:aws-java-sdk-dynamodb` - for `DynamoDbMetadataStore` and `DynamoDbLockRegistry`
+* `com.amazonaws:dynamodb-lock-client` - for `DynamoDbLockRegistry`
+
+Consider to include an appropriate dependency into your project when you use particular component from this project. 
+
 # Adapters
 
 ## Amazon Simple Storage Service (Amazon S3)

build.gradle

@@ -89,8 +89,6 @@ dependencies {
 	compile 'org.springframework.integration:spring-integration-core'
 	compile 'org.springframework.cloud:spring-cloud-aws-core'
 
-	compile("com.fasterxml.jackson.core:jackson-databind:$jacksonVersion", optional)
-
 	compile('org.springframework.cloud:spring-cloud-aws-messaging', optional)
 	compile('org.springframework.integration:spring-integration-file', optional)
 	compile('org.springframework.integration:spring-integration-http', optional)