added formatter action

.github/workflows/format_check.yml

@@ -0,0 +1,33 @@
+name: format-check
+on:
+  push:
+    branches:
+      - master
+      - release-*
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: '1'
+      - uses: actions/checkout@v4
+      - name: Format check
+        shell: julia --color=yes {0}
+        run: |
+          using Pkg
+          # If you update the version, also update the style guide docs.
+          Pkg.add(PackageSpec(name="JuliaFormatter", version="1"))
+          using JuliaFormatter
+          format("src", verbose=true)
+          format("test", verbose=true)
+          format("docs", verbose=true)
+          out = String(read(Cmd(`git diff`)))
+          if isempty(out)
+              exit(0)
+          end
+          @error "Some files have not been formatted !!!"
+          write(stdout, out)
+          exit(1)