Set up license-eye to check license (#110)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index abc273a..1d53e65 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -37,6 +37,10 @@
         uses: actions/checkout@v2
         with:
           submodules: true
+      - name: Check License
+        uses: apache/skywalking-eyes@9bd5feb86b5817aa6072b008f9866a2c3bbc8587
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
diff --git a/.gitignore b/.gitignore
index b0b2fe2..bbc1313 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,21 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
 .idea/
 *.iml
 .DS_Store
diff --git a/.gitmodules b/.gitmodules
index d1734e3..ebb8ea3 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,21 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
 [submodule "protocol"]
 	path = protocol
 	url = https://github.com/apache/skywalking-data-collect-protocol
diff --git a/.licenserc.yaml b/.licenserc.yaml
new file mode 100644
index 0000000..a1f5720
--- /dev/null
+++ b/.licenserc.yaml
@@ -0,0 +1,32 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+header:
+  license:
+    spdx-id: Apache-2.0
+    copyright-owner: Apache Software Foundation
+
+  paths-ignore:
+    - 'dist'
+    - 'licenses'
+    - '**/*.md'
+    - 'LICENSE'
+    - 'NOTICE'
+    - '.github/PULL_REQUEST_TEMPLATE'
+
+  comment: on-failure
diff --git a/.muse/config.toml b/.muse/config.toml
index 19a4784..3f5b6bd 100644
--- a/.muse/config.toml
+++ b/.muse/config.toml
@@ -1 +1,19 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
 ignore = [ "Unused ignore", "Invalid decoration", "blacklist", "Missing argument" ]