Add some Maven materials (#1542)

Co-authored-by: sk8higher <sk8higher@iballwasrawt.ru>

content/roadmaps/109-java/content/102-java-build-tools/101-maven.md

@@ -1 +1,7 @@
-# Maven
+# Maven
+
+Maven is an open-source build tool, used primarily for Java projects.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Site' href='https://maven.apache.org/guides/getting-started/'>Getting started</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://spring.io/guides/gs/maven/'>Building Java Projects with Maven</BadgeLink>