Update README for encrypt/decrypt via Transit

Readme file was missing the transit encrypt/decrypt feature that many enterprise users will be interested in.

Original pull request: gh-322.

README.adoc

@@ -32,7 +32,7 @@ Specifically for Spring applications:
 {docs}#vault.config.authentication.awsec2[AWS-EC2] authentication,
 {docs}#vault.config.authentication.awsiam[AWS-IAM] authentication, and
 {docs}#vault.config.authentication.kubernetes[Kubernetes] authentication.
-
+* Transmit data to Vault for encryption and decryption.
 * Bootstrap application context: a parent context for the main application that can be trained to do anything.
 
 
@@ -564,4 +564,4 @@ Go to `File` -> `Settings` -> `Other settings` -> `Checkstyle`. There click on t
 - `checkstyle.suppressions.file` - default suppressions. Please point it to the Spring Cloud Build's, `spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml` file either in your cloned repo or via the `https://raw.githubusercontent.com/spring-cloud/spring-cloud-build/master/spring-cloud-build-tools/src/checkstyle/checkstyle-suppressions.xml` URL.
 - `checkstyle.additional.suppressions.file` - this variable corresponds to suppressions in your local project. E.g. you're working on `spring-cloud-contract`. Then point to the `project-root/src/checkstyle/checkstyle-suppressions.xml` folder. Example for `spring-cloud-contract` would be: `/home/username/spring-cloud-contract/src/checkstyle/checkstyle-suppressions.xml`.
 
-IMPORTANT: Remember to set the `Scan Scope` to `All sources` since we apply checkstyle rules for production and test sources.
+IMPORTANT: Remember to set the `Scan Scope` to `All sources` since we apply checkstyle rules for production and test sources.