feat: Add stub for agent 'init' command

src/main/java/com/appland/appmap/cli/CLI.java

@@ -8,7 +8,10 @@ public class CLI {
   public String directory;
 
   public static void main(String[] args) {
-    int exitCode = new CommandLine(new CLI()).addSubcommand("status", Status.class).execute(args);
+    int exitCode = new CommandLine(new CLI())
+        .addSubcommand("status", Status.class)
+        .addSubcommand("init", Init.class)
+        .execute(args);
     System.exit(exitCode);
   }
 }

src/main/java/com/appland/appmap/cli/Init.java

@@ -0,0 +1,15 @@
+package com.appland.appmap.cli;
+
+import picocli.CommandLine;
+import java.util.concurrent.Callable;
+
+@CommandLine.Command(name = "init", description = "Suggests AppMap configuration settings for a new project.")
+public class Init implements Callable<Integer> {
+  @CommandLine.ParentCommand
+  private CLI parent;
+
+  public Integer call() throws Exception {
+    System.err.printf("Init AppMap project configuration in directory: %s", parent.directory);
+    return 0;
+  }
+}