[dbsystel] Add pom.xml

Usually, Gradle’s `maven-publish` plug-in is responsible for generating
a POM file dynamically at build time.

However, thanks to the excellent work of @MrDOS and others, upstream's
Gradle-6-based process is currently being replaced [1] by a
Gradle-8-based one. The latter uses a different, more convenient method
to generate the POM.

In DB Systel’s fork, we’re not going to adopt that Gradle-8-based
build process for production until upstream PR NeuronRobotics#238 is properly tested,
merged, and included in a stable upstream release.

Given that we need to get two critical bugfixes that we’ve cherry-picked
into production quickly, we’re going to accept some duplication and
commit the POM to Git for the time being.

[1]: NeuronRobotics#238

pom.xml

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>de.bahn</groupId>
+  <artifactId>nrjavaserial</artifactId>
+  <version>5.2.1+dbsystel1</version>
+  <name>NRJavaSerial</name>
+  <description>A fork of the RXTX library with a focus on ease of use and embeddability in other libraries.</description>
+  <url>http://neuronrobotics.com</url>
+  <licenses>
+    <license>
+      <name>RXTX License v 2.1 - LGPL v 2.1 + Linking Over Controlled Interface</name>
+      <url>https://raw.githubusercontent.com/dbsystel/nrjavaserial/master/LICENSE</url>
+    </license>
+  </licenses>
+  <developers>
+    <developer>
+      <id>madhephaestus</id>
+      <name>Kevin Harrington</name>
+      <email>[email protected]</email>
+    </developer>
+    <developer>
+      <id>MrDOS</id>
+      <name>Samuel Coleman</name>
+      <email>[email protected]</email>
+    </developer>
+  </developers>
+  <scm>
+    <connection>scm:git:https://github.com/dbsystel/nrjavaserial.git</connection>
+    <developerConnection>scm:git:[email protected]:dbsystel/nrjavaserial.git</developerConnection>
+    <url>https://github.com/dbsystel/nrjavaserial</url>
+  </scm>
+  <dependencies>
+    <dependency>
+      <groupId>commons-net</groupId>
+      <artifactId>commons-net</artifactId>
+      <version>3.3</version>
+      <scope>compile</scope>
+    </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.12</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+</project>