Add CI and cosmetic changes

.github/workflows/h264-profile-level-id.yaml

@@ -0,0 +1,50 @@
+name: h264-profile-level-id
+
+on: [push, pull_request]
+
+concurrency:
+  # Cancel a currently running workflow from the same PR, branch or tag when a
+  # new workflow is triggered.
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  ci:
+    strategy:
+      matrix:
+        ci:
+          - os: ubuntu-20.04
+            node: 16
+          - os: macos-12
+            node: 18
+          - os: windows-2022
+            node: 20
+
+    runs-on: ${{ matrix.ci.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.ci.node }}
+
+      - name: Configure cache
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.npm
+          key: ${{ matrix.ci.os }}-node-${{ hashFiles('**/package.json') }}
+          restore-keys: |
+            ${{ matrix.ci.os }}-node-
+
+      - name: npm ci
+        run: npm ci --foreground-scripts
+
+      - name: npm run lint
+        run: npm run lint
+
+      - name: npm run test
+        run: npm run test

README.md

@@ -45,32 +45,32 @@ enum Profile
 ```ts
 enum Level
 {
-  Level1_b = 0,
-  Level1 = 10,
-  Level1_1 = 11,
-  Level1_2 = 12,
-  Level1_3 = 13,
-  Level2 = 20,
-  Level2_1 = 21,
-  Level2_2 = 22,
-  Level3 = 30,
-  Level3_1 = 31,
-  Level3_2 = 32,
-  Level4 = 40,
-  Level4_1 = 41,
-  Level4_2 = 42,
-  Level5 = 50,
-  Level5_1 = 51,
-  Level5_2 = 52
+  L1_b = 0,
+  L1 = 10,
+  L1_1 = 11,
+  L1_2 = 12,
+  L1_3 = 13,
+  L2 = 20,
+  L2_1 = 21,
+  L2_2 = 22,
+  L3 = 30,
+  L3_1 = 31,
+  L3_2 = 32,
+  L4 = 40,
+  L4_1 = 41,
+  L4_2 = 42,
+  L5 = 50,
+  L5_1 = 51,
+  L5_2 = 52
 }
 ```
 
 ### class ProfileLevelId
 
-Class containing both H264 Profile and Level.
+Class containing both H264 profile and level.
 
 ```js
-const profile_level_id = new ProfileLevelId(Profile.Main, Level.Level3_1);
+const profile_level_id = new ProfileLevelId(Profile.Main, Level.L3_1);
 
 console.log('profile:%d, level:%d', profile_level_id.profile, profile_level_id.level);
 // => profile:3, level:31