added script to create a new issue branch

.gitignore

@@ -0,0 +1 @@
+.idea

zx/new_issue_branch.mjs

@@ -0,0 +1,14 @@
+#!/usr/bin/env zx
+
+$.verbose = false;
+
+const issueNumber = process.argv[3];
+const issue = await $`gh issue view ${issueNumber} --repo cosmos/ibc-go --json title`;
+const issueTitle = JSON.parse(issue).title;
+
+let sanitizedTitle = issueTitle.replaceAll(" ", "-").trim()
+sanitizedTitle = sanitizedTitle.replaceAll(".", "")
+sanitizedTitle = sanitizedTitle.replaceAll("`", "")
+sanitizedTitle = sanitizedTitle.replaceAll(":", "")
+
+await $`git checkout -b "cian/issue#${issueNumber}-${sanitizedTitle}"`;