Update on "Add script to cut release branch"

Step 1 of release process: Create a release branch.

The branch is named with `release/MAJOR.MINOR`.

From executorch root, run `./scripts/release/cut-release-branch.sh` will cut a release branch off stable branch (`viable/strict`) by default. Use `GIT_BRANCH_TO_CUT_FROM=main ./scripts/release/cut-release-branch.sh` to cut off `main` branch.



Differential Revision: [D55208762](https://our.internmc.facebook.com/intern/diff/D55208762)

[ghstack-poisoned]

Author: guangy10

scripts/release/cut-release-branch.sh

@@ -7,10 +7,10 @@ to the right script.
 This script can be used to cut any branch on any repository
 
 For `pytorch/executorch` usage would be like:
-> DRY_RUN=disabled cut-release-branch.sh
+> DRY_RUN=disabled ./scripts/release/cut-release-branch.sh
 
 or to cut from main branch:
-> DRY_RUN=disabled GIT_BRANCH_TO_CUT_FROM=main cut-release-branch.sh
+> DRY_RUN=disabled GIT_BRANCH_TO_CUT_FROM=main ./scripts/release/cut-release-branch.sh
 '
 
 set -eou pipefail

version.txt

@@ -1 +1 @@
-0.2.0-rc1
+0.2.0a0