Add steps for 03-01

03_01.md

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+# Learning Jenkins, 03-01: Install Jenkins as a Container
+
+# Prerequisites
+You will need to configure Maven as a global build tool.
+
+In the Jenkins web interface, go to:
+
+`Manage Jenkins` -> `Global Tool Configuration` -> `Maven installations` -> `Add Maven`.
+
+Give your Maven installation a name and check the option to `Install automatically`.
+
+# Setting up the Jenkins Job
+Create a freestyle job and configure it as follows:
+
+1. Add a build step using `Invoke Top-Level Maven Target`.
+2. For the goal, enter `package`.
+3. Add a build step to run the compiled package:
+- *FOR WINDOWS*: Use the `Execute Windows batch command` build step
+- FOR macOS, Linux, and Docker: Use the `Execute shell` build step
+4. Enter the following command:
+```
+java -cp target/hello-1.0-SNAPSHOT.jar com.learningjenkins.App
+```
+5. Save the job and start a build.
+