Adds changelog config for gitea changelog cli tool (#77)

#### 📖 Summary

- adds initial default config for changelog generation

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [ ] Tested via Drone.io pipeline
- [x] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #77

.changelog.yml

@@ -0,0 +1,32 @@
+# The full repository name
+repo: OCram85/PSCredentialStore
+
+# Service type (gitea or github)
+service: gitea
+
+# Base URL for Gitea instance if using gitea service type (optional)
+# Default: https://gitea.com
+base-url: https://gitea.ocram85.com
+
+# Changelog groups and which labeled PRs to add to each group
+groups:
+  - name: ✨ FEATURES
+    labels:
+      - feature
+  - name: 📦 META
+    labels:
+      - meta
+  - name: 🐛 BUGFIXES
+    labels:
+      - bug
+  - name: 🛠️ ENHANCEMENTS
+    labels:
+      - enhancement
+  - name: 📚 DOCS
+    labels:
+      - docs
+  - name: 🔖 MISC
+    default: true
+
+# regex indicating which labels to skip for the changelog
+skip-labels: skip-changelog|backport\/.+