add documentation on releasing new versions

RELEASE.md

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+Release Instructions
+--------------------
+
+Pre-Commit
+----------
+1. `pushd ngrok-java-native && fix-n-fmt && popd`
+1. `export NGROK_AUTHTOKEN="<your_authtoken>"; make all`
+
+Prepare Release
+---------------
+NOTE: this step needs to make commits to main, which will be blocked by branch controls. You will
+need to get in contact with an admin to temporarily remove the branch control while completing this step.
+
+1. In the `ngrok-java` repo, click on Actions in the top.
+1. Select the "Release Prepare" option
+1. On the right side, select "Run workflow"
+1. For `releaseVersion`, put in the desired release version
+   1. do NOT include a `v` in front of the version number
+1. For `developmentVersion`, put in the following minor version, appended with `-SNAPSHOT`
+   1. For instance, if releasing `1.6.3`, the `developmentVersion` should be `1.7.0-SNAPSHOT`
+   1. do NOT include a `v` in front of the version number
+1. Press "Run workflow"
+1. Verify that the workflow runs successfully
+1. Once done, check the commit history, there should be two new commits
+
+Release
+-------
+
+1. In the `ngrok-java` repo, click on Actions in the top.
+1. Select the "Release Perform" option
+1. On the right side, select "Run workflow"
+1. For `releaseVersion`, put in the release version you specified in the "Prepare Release" workflow
+   1. NOTE: do NOT include a `v` in front of the version number
+1. Press "Run workflow"
+1. Verify that the workflow runs successfully