Adding SpringBoot docs for new integrations

[salaboy]

Description

Initial Spring Boot documentation added to the Java SDK Docs

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1122

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[salaboy]

@artursouza @cicoyle please review :)

[cicoyle]

We typically link to examples in the java-sdk so that they are maintained and kept updated. Is this example in the sdk and if not, can you add it?

[salaboy]

@cicoyle This is a bit different, as it uses Testcontainers and the intention here is to keep it as simple as possible for spring users to copy. Maybe we can have a separate directory for it inside the examples, but I wanted to make sure that this doesn't get all the dependencies from other examples that overly complicate it when users want to copy the project structure.

[cicoyle]

text looks good to me, so Ill approve - still think we want this in the java-sdk or quickstarts: https://github.com/salaboy/dapr-spring-boot-docs-examples

cc @artursouza your thoughts ^?

[artursouza]

text looks good to me, so Ill approve - still think we want this in the java-sdk or quickstarts: https://github.com/salaboy/dapr-spring-boot-docs-examples

cc @artursouza your thoughts ^?

Yes, we need them there. It can be a new PR.