Add doc page on DB2 module

docs/modules/databases/db2.md

@@ -0,0 +1,47 @@
+# DB2 Module
+
+See [Database containers](./index.md) for documentation and usage that is common to all relational database container types.
+
+## Usage example
+
+Running DB2 as a stand-in for in a test:
+
+```java
+public class SomeTest {
+
+    @ClassRule
+    public Db2Container db2 = new Db2Container()
+        .acceptLicense();
+
+    @Test
+    public void someTestMethod() {
+        String url = db2.getJdbcUrl();
+
+        ... create a connection and run test as normal
+    }
+```
+
+!!! warning "EULA Acceptance"
+    Due to licencing restrictions you are required to accept an EULA for this container image. To indicate that you accept the DB2 image EULA, call the `acceptLicense()` method, or place a file at the root of the classpath named `container-license-acceptance.txt`, e.g. at `src/test/resources/container-license-acceptance.txt`. This file should contain the line: `ibmcom/db2:11.5.0.0a` (or, if you are overriding the docker image name/tag, update accordingly).
+
+    Please see the [`ibmcom/db2` image documentation](https://hub.docker.com/r/ibmcom/db2) for a link to the EULA document.
+
+## Adding this module to your project dependencies
+
+Add the following dependency to your `pom.xml`/`build.gradle` file:
+
+```groovy tab='Gradle'
+testCompile "org.testcontainers:db2:{{latest_version}}"
+```
+
+```xml tab='Maven'
+<dependency>
+    <groupId>org.testcontainers</groupId>
+    <artifactId>db2</artifactId>
+    <version>{{latest_version}}</version>
+    <scope>test</scope>
+</dependency>
+```
+
+!!! hint
+    Adding this Testcontainers library JAR will not automatically add a database driver JAR to your project. You should ensure that your project also has a suitable database driver as a dependency.

modules/db2/src/main/java/org/testcontainers/containers/Db2Container.java

@@ -65,6 +65,10 @@ protected void configure() {
             addEnv("ARCHIVE_LOGS", "false");
     }
 
+    /**
+     * Accepts the license for the DB2 container by setting the LICENSE=accept
+     * variable as described at <a href="https://hub.docker.com/r/ibmcom/db2">https://hub.docker.com/r/ibmcom/db2</a>
+     */
     public SELF acceptLicense() {
         addEnv("LICENSE", "accept");
         return self();