chore: add release-please configuration

Configure release-please with Python release type and changelog settings.

Author: dbrattli

.github/release-please-config.json

@@ -0,0 +1,11 @@
+{
+  "packages": {
+    ".": {
+      "release-type": "python",
+      "package-name": "oslash",
+      "changelog-path": "CHANGELOG.md",
+      "bump-minor-pre-major": true,
+      "bump-patch-for-minor-pre-major": false
+    }
+  }
+}