[commons-rng] 02/21: Add HOWTO.md to show how to run the example application

[aherbert]

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commit a074a16df3e4949f40e16708447cc9881fa5d3b8
Author: Alex Herbert <aherb...@apache.org>
AuthorDate: Thu Aug 5 13:33:55 2021 +0100

    Add HOWTO.md to show how to run the example application
---
 commons-rng-examples/examples-quadrature/HOWTO.md | 41 +++++++++++++++++++++++
 1 file changed, 41 insertions(+)

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+<!---
+ 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.
+-->
+
+Apache Commons RNG Examples Quadrature
+======================================
+
+The quadrature test application will output an approximation for &pi; 
(3.14159...) using
+Monte-Carlo integration. The application generates random points within a unit 
box and counts
+the number of points within the unit circle. The approximation to &pi; is made 
using the ratio of
+the points within the circle to the total number of points, which should be 
&pi;/4.
+
+Build the application using:
+
+        mvn package -P examples-quadrature
+
+Run the application using 2 arguments:
+
+1. The number of random points
+2. The name of the random generator
+
+For example:
+
+        java -jar target/examples-quadrature.jar 1000000 KISS
+
+This will output:
+
+        After generating 2000000 random numbers, the error on |𝛑 - 3.14224| is 
6.473464102070281E-4