Build: Add semantic release and commitizen

For automatic releases we need semantic release and to have consitent commit messages we also use
commitizen as tool

.gitignore

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+/node_modules

.releaserc

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+{
+    "branch": "release",
+    "analyzeCommits": {
+        "preset": "eslint",
+        "releaseRules": [
+            {"tag": "Upgrade", "release": "patch"}
+        ]
+    },
+    "verifyConditions": [
+        {
+            "path": "@semantic-release/changelog",
+            "changelogFile": "CHANGELOG.md",
+            "changelogTitle": "Changelog Unikka/FilePreviews"
+        },
+        "@semantic-release/github"
+    ],
+    "prepare": [
+        "@semantic-release/changelog",
+        "@semantic-release/npm",
+        {
+            "path": "@semantic-release/git",
+            "assets": ["package.json", "CHANGELOG.md"],
+            "message": "Build: Release ${nextRelease.version} [skip ci]"
+        }
+    ],
+    "generateNotes": {
+      "preset": "eslint",
+      "writerOpts": {
+        "commitsSort": ["subject", "scope"],
+      }
+    },
+    "publish": ["@semantic-release/github"]
+}

package.json

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+{
+    "name": "unikka-filepreview",
+    "version": "1.0.1",
+    "repository": "https://github.com/Unikka/FilePreviews.git",
+    "license": "GNU GPLv3",
+    "dependencies": {},
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 0",
+        "semantic-release": "semantic-release",
+        "commit": "git-cz"
+    },
+    "devDependencies": {
+        "@semantic-release/changelog": "^5.0.1",
+        "@semantic-release/git": "^9.0.0",
+        "@semantic-release/release-notes-generator": "^9.0.1",
+        "commitizen": "^4.1.2",
+        "conventional-changelog-eslint": "^3.0.8",
+        "cz-adapter-eslint": "^0.3.0",
+        "semantic-release": "^17.0.8"
+    },
+    "config": {
+        "commitizen": {
+            "path": "./node_modules/cz-adapter-eslint"
+        }
+    }
+}