Create fix file issue template (#1495)

Create fix_file.md template file for new fix file request issue. This should help formalize the process and document updates.

New issue will auto-assign to @KateFriedman-NOAA and @WalterKolczynski-NOAA (the developers with access to make fix files changes).

Fixes #1492

.github/ISSUE_TEMPLATE/fix_file.md

@@ -0,0 +1,24 @@
+---
+name: Fix File Update
+about: Use this template for adding, updating, or removing fix files from global dataset
+title:
+labels: Fix Files
+assignees:
+  - KateFriedman-NOAA
+  - WalterKolczynski-NOAA
+
+---
+
+**Description**
+<!-- Provide a consise description of the fix file update being requested. -->
+<!-- State if this is adding, updating, and/or removing fix files from dataset. -->
+<!-- Include related issues in component repositories. -->
+<!-- Are there related workflow or component changes to use the affected fix files? -->
+<!-- Provide pickup locations for new/altered fix files or list files to be removed. -->
+
+**Tasks**
+<!-- Update task list as needed for request. -->
+- [ ] Discuss needs with global-workflow developer assigned to request.
+- [ ] Add/update/remove fix file(s) in fix sets on supported platforms (global-workflow assignee task).
+- [ ] Update "Fix File Management" spreadsheet (https://docs.google.com/spreadsheets/d/1BeIvcz6TO3If4YCqkUK-oz_kGS9q2wTjwLS-BBemSEY/edit?usp=sharing).
+- [ ] Make related workflow/component updates.