Add ".asf.yaml"

Cf. https://cwiki.apache.org/confluence/display/INFRA/Git+-+.asf.yaml+features

.asf.yaml

@@ -0,0 +1,31 @@
+# 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.
+
+github:
+  description: "Miscellaneous math-related utilities"
+  homepage: https://commons.apache.org/math
+  labels:
+    - java
+    - math
+    - stat
+    - polynomial
+    - interpolation
+    - integration
+    - solver
+    - fitting
+    - least-squares
+    - optimization
+    - transforms
+    - clustering