Create Pending Changelog Checker Action and initial CHANGELOG.md and …

…CHANGELOG-PENDING.md files (#252)


* Add Pending Changelog Checker action to check for CHANGELOG-PENDING.md file in PRs

* set noChangeLogLabel to no_changelog

.github/workflows/pending-changelog-checker.yml

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+name: "Pending Changelog Checker"
+
+on:
+  pull_request:
+    types: [assigned, opened, synchronize, reopened, labeled, unlabeled]
+    branches:
+      - main
+
+jobs:
+  changelog-checker:
+    runs-on: "ubuntu-latest"
+    steps:
+      - name: "Checkout source code"
+        uses: "actions/checkout@v2"
+      - name: Changelog check
+        uses: celestiaorg/changelog-checker@v1
+        with:
+          fileName: CHANGELOG-PENDING.md
+          checkNotification: Simple
+          noChangeLogLabel: no_changelog
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

CHANGELOG-PENDING.md

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+# Unreleased Changes
+
+## vX.Y.Z
+
+Month, DD, YYYY
+
+### BREAKING CHANGES
+
+- [go package] (Link to PR) Description @username
+
+### FEATURES
+
+- [go package] (Link to PR) Description @username
+
+### IMPROVEMENTS
+
+- [go package] (Link to PR) Description @username
+
+### BUG FIXES
+
+- [go package] (Link to PR) Description @username

CHANGELOG.md

@@ -0,0 +1,21 @@
+# Unreleased Changes
+
+## vX.Y.Z
+
+Month, DD, YYYY
+
+### BREAKING CHANGES
+
+- [go package] (Link to PR) Description @username
+
+### FEATURES
+
+- [go package] (Link to PR) Description @username
+
+### IMPROVEMENTS
+
+- [go package] (Link to PR) Description @username
+
+### BUG FIXES
+
+- [go package] (Link to PR) Description @username