Added change log file

Added GitHub action to check if change log was modified.

.github/workflows/check-changelog.yml

@@ -0,0 +1,24 @@
+name: check changelog
+
+on:
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  check-changelog:
+    if: "!contains(github.event.head_commit.message, '[skip changelog]')"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: 📖 Verify changelog updates
+        uses: dorny/paths-filter@v2
+        id: changed_files
+        with:
+          filters: |
+            changelog:
+              - 'CHANGELOG.md'
+      - name: 📖 Let job fail if changelog not updated
+        if: steps.changed_files.outputs.changelog == 'false'
+        run: |
+          exit 1

.github/workflows/pull-request.json

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+{
+    "pull_request": {
+        "head": {
+            "ref": "CeetronSolutions:added-smart-node-selector"
+        },
+        "base": {
+            "ref": "master"
+        }
+    }
+}

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [UNRELEASED] - YYYY-MM-DD
+### Fixed

pull-request.json

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+{
+    "pull_request": {
+        "head": {
+            "ref": "refs/heads/added-changelog-and-action"
+        },
+        "base": {
+            "ref": "refs/heads/master"
+        }
+    }
+}