Adding Basic App Configuration Refresh Sample

[mrm9084]

Purpose

Gives an example of Refreshing Configuration while application is running

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[x] Other... Please describe:

New Sample

How to Test

• Get the code
  See Readme

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
mvn clean package spring-boot:run

• Test the code

mvn clean package spring-boot:run

[backwind1233]

Hi, @mrm9084 Can you also update the README.md and pom.xml
I am not familiar with app configuration, I can run the sample, but I don't know how to trigger the refresh, can you give a doc to guide me about the refresh feature?

[backwind1233]

I think you can write some description about this sample here.