Added MavROS drone drivers with speed control

assets/gazebo/launch/follow_road.launch

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+<?xml version="1.0" encoding="UTF-8"?>
+<launch>
+  <!-- We resume the logic in empty_world.launch, changing only the name of the world to be launched -->
+  <include file="$(find gazebo_ros)/launch/empty_world.launch">
+    <arg name="world_name" value="road_drone_textures_ROS.world"/> <!-- Note: the world_name is with respect to GAZEBO_RESOURCE_PATH environmental variable -->
+    <arg name="paused" value="false"/>
+    <arg name="use_sim_time" value="true"/>
+    <arg name="gui" value="true"/>
+    <arg name="headless" value="false"/>
+    <arg name="debug" value="false"/>
+    <arg name="verbose" default="true"/>
+  </include>
+
+  <arg name="fcu_url" default="udp://:14540@127.0.0.1:14540" />
+	<arg name="gcs_url" default="" />
+	<arg name="tgt_system" default="1" />
+	<arg name="tgt_component" default="1" />
+	<arg name="log_output" default="screen" />
+	<arg name="fcu_protocol" default="v2.0" />
+	<arg name="respawn_mavros" default="false" />
+
+	<include file="$(find mavros)/launch/node.launch">
+		<arg name="pluginlists_yaml" value="$(find mavros)/launch/px4_pluginlists.yaml" />
+		<arg name="config_yaml" value="$(find mavros)/launch/px4_config.yaml" />
+
+		<arg name="fcu_url" value="$(arg fcu_url)" />
+		<arg name="gcs_url" value="$(arg gcs_url)" />
+		<arg name="tgt_system" value="$(arg tgt_system)" />
+		<arg name="tgt_component" value="$(arg tgt_component)" />
+		<arg name="log_output" value="$(arg log_output)" />
+		<arg name="fcu_protocol" value="$(arg fcu_protocol)" />
+		<arg name="respawn_mavros" default="$(arg respawn_mavros)" />
+	</include>
+
+  <node pkg="mavros" type="px4.sh"  name="px4" output="screen"/>
+</launch>

assets/gazebo/models/house_4/model.config

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+<?xml version="1.0"?>
+
+<model>
+  <name>Nurburgrin</name>
+  <version>1.0</version>
+  <sdf version='1.5'>model.sdf</sdf>
+
+  <author>
+    <name>Pablo Moreno</name>
+    <email>pablomvera14@gmail.com</email>
+  </author>
+
+  <description>
+    New model of house.
+  </description>
+</model>

assets/gazebo/models/house_4/model.sdf

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+<?xml version="1.0"?>
+<sdf version="1.4">
+  <model name="House 4">
+    <static>true</static>
+    <link name="link">
+      <collision name="collision">
+        <geometry>
+          <mesh>
+            <uri>model://house_4/meshes/house_4.dae</uri>
+        </mesh>
+      </geometry>
+    </collision>
+      <visual name="visual">
+        <geometry>
+          <mesh>
+            <uri>model://house_4/meshes/house_4.dae</uri>
+        </mesh>
+      </geometry>
+    </visual>
+  </link>
+</model>
+</sdf>