This commit updates URLs to prefer the https protocol. Redirects are not followed to avoid accidentally expanding intentionally shortened URLs (i.e. if using a URL shortener).
# Fixed URLs
## Fixed Success
These URLs were switched to an https URL with a 2xx status. While the status was successful, your review is still recommended.
* [ ] http://www.apache.org/licenses/LICENSE-2.0 with 33 occurrences migrated to:
https://www.apache.org/licenses/LICENSE-2.0 ([https](https://www.apache.org/licenses/LICENSE-2.0) result 200).
README.md:
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* Make link to Spring Batch project on spring.io for more context as we already have the git repo
* General Markdown cleanup
* Maven command cleanup
* Fix commercial support link
* Add links to GitHub issues
Added CONTRIBUTING.md from Spring Batch project as a template
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* CLA project was left as is (SIE doesn't have a specific entry either)
* Removed references to "checkout and building" until thats defined
* Add links to GitHub issues