Added README

README.md

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+# [Bld](https://rife2.com/bld) Extension to Perform Static Code Analysis with [PMD](https://pmd.github.io/)
+
+
+[![License (3-Clause BSD)](https://img.shields.io/badge/license-BSD%203--Clause-blue.svg?style=flat-square)](http://opensource.org/licenses/BSD-3-Clause)
+[![Java](https://img.shields.io/badge/java-17%2B-blue)](https://www.oracle.com/java/technologies/javase/jdk17-archive-downloads.html)
+[![GitHub CI](https://github.com/rife2/bld-pmd/actions/workflows/bld.yml/badge.svg)](https://github.com/rife2/bld-pmd/actions/workflows/bld.yml)
+
+To check all source code using the [java quickstart rule](https://pmd.github.io/pmd/pmd_rules_java.html).
+
+```java
+@BuildCommand
+public void pmd() throws Exception {
+    new PmdOperation(this).execute();
+}
+```
+```text
+./bld pmd test
+```
+
+To check the main source code using a custom rule, [java error prone rule](https://pmd.github.io/pmd/pmd_rules_java.html) and failing on any violation.
+
+```java
+@BuildCommand
+public void pmdMain() throws Exception {
+    new PmdOperation(this)
+        .failOnValidation(true)
+        .addInputPath(project.srcMainDirectory().toPath())
+        .addRuletSet("config/pmd.xml", "category/java/errorprone.xml");
+        .execute();
+}
+```
+
+```text
+./dld compile pmdMain
+```
+
+Please check the [PmdOperation documentation](https://rife2.github.io/bld-pmd/rife/bld/extension/PmdOperation.html#method-summary) for all available configuration options.