Revert "Remove Maven build."

This reverts commit c2364fa.

pom.xml

@@ -0,0 +1,114 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+                      http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+	<groupId>io.sf.carte</groupId>
+	<artifactId>css4j-dist</artifactId>
+	<version>3.5.0</version>
+  </parent>
+  <groupId>io.sf.carte</groupId>
+  <artifactId>css4j-agent</artifactId>
+  <packaging>jar</packaging>
+  <dependencies>
+	<dependency>
+		<groupId>io.sf.carte</groupId>
+		<artifactId>css4j</artifactId>
+		<version>${project.parent.version}</version>
+		<type>jar</type>
+		<scope>compile</scope>
+		<optional>false</optional>
+	</dependency>
+	<dependency>
+		<groupId>io.sf.carte</groupId>
+		<artifactId>xml-dtd</artifactId>
+		<version>${project.parent.version}</version>
+		<type>jar</type>
+		<scope>compile</scope>
+		<optional>false</optional>
+	</dependency>
+	<dependency>
+		<groupId>io.sf.carte</groupId>
+		<artifactId>css4j</artifactId>
+		<version>${project.parent.version}</version>
+		<type>test-jar</type>
+		<scope>test</scope>
+	</dependency>
+	<dependency>
+		<groupId>nu.validator</groupId>
+		<artifactId>htmlparser</artifactId>
+		<version>[1.4,1.5)</version>
+		<scope>compile</scope>
+		<optional>false</optional>
+	</dependency>
+	<!-- Not required for compiling, but this dependency was optional in the
+		core module and it is mandatory for user agents. So we set as a
+		mandatory dependency here. -->
+	<dependency>
+		<groupId>org.slf4j</groupId>
+		<artifactId>slf4j-api</artifactId>
+		<version>1.7.30</version>
+		<scope>compile</scope>
+		<optional>false</optional>
+	</dependency>
+  </dependencies>
+  <build>
+	<directory>${project.basedir}/build</directory>
+	<outputDirectory>${project.build.directory}/bin</outputDirectory>
+	<finalName>${project.artifactId}-${project.version}</finalName>
+	<testOutputDirectory>${project.build.directory}/testbin</testOutputDirectory>
+	<sourceDirectory>${project.basedir}/src</sourceDirectory>
+	<testSourceDirectory>${project.basedir}/junit</testSourceDirectory>
+	<plugins>
+		<plugin>
+			<groupId>org.apache.maven.plugins</groupId>
+			<artifactId>maven-javadoc-plugin</artifactId>
+			<configuration>
+				<links>
+					<link>https://docs.oracle.com/en/java/javase/11/docs/api/</link>
+					<link>https://css4j.github.io/api/3/</link>
+					<link>https://about.validator.nu/htmlparser/apidocs/</link>
+				</links>
+			</configuration>
+		</plugin>
+	</plugins>
+	<resources>
+		<resource>
+			<directory>${project.build.sourceDirectory}</directory>
+			<excludes>
+				<exclude>**/*.java</exclude>
+			</excludes>
+		</resource>
+		<resource>
+			<directory>${project.basedir}</directory>
+			<includes>
+				<include>LICENSE.txt</include>
+				<include>LICENSES.txt</include>
+			</includes>
+		</resource>
+	</resources>
+	<testResources>
+		<testResource>
+			<directory>${project.basedir}/junit</directory>
+			<excludes>
+				<exclude>**/*.java</exclude>
+			</excludes>
+		</testResource>
+	</testResources>
+  </build>
+  <scm>
+	<connection>scm:git:https://github.com/css4j/css4j-agent.git</connection>
+	<url>https://github.com/css4j/css4j-agent</url>
+  </scm>
+  <distributionManagement>
+	<repository>
+		<id>github</id>
+		<name>GitHub css4j Apache Maven Packages</name>
+		<url>https://maven.pkg.github.com/css4j/css4j-agent</url>
+	</repository>
+  </distributionManagement>
+  <issueManagement>
+	<url>https://github.com/css4j/css4j-agent/issues</url>
+  </issueManagement>
+</project>