Update README with new source mirror URL and add GitHub Actions workflow for repository mirroring

.github/workflows/mirror.yml

@@ -0,0 +1,25 @@
+name: Mirror
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  mirror:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Mirror to remote repository
+        uses: yesolutions/mirror-action@master
+        with:
+          REMOTE: "https://git.popov.link/go-metatrader4.git"
+          GIT_USERNAME: ${{ secrets.GIT_USERNAME }}
+          GIT_PASSWORD: ${{ secrets.GIT_PASSWORD }}

README.md

@@ -41,7 +41,7 @@ Use `WithAutoClose(false)` if you want to reuse the connection manually via `cli
 ## Project Info
 
 - Vanity import path: `go.popov.link/metatrader4`
-- Source mirror (read-only): [code.popov.link](https://code.popov.link/valentineus/go-metatrader4)
+- Source mirror (read-only): [git.popov.link](https://git.popov.link/go-metatrader4/)
 - Issues and contributions: [GitHub](https://github.com/valentineus/go-metatrader4/issues)
 
 Maintained by [Valentin Popov](mailto:valentin@popov.link).