new howto for launching Apollo using rosbag on localhost (part of old ReadMe)

docs/howto/howto_launch_Apollo.md

+# How to Launch and Run Apollo 
+First check and make sure you are in development docker container before you proceed. Now you will need to build from the source. If you want to run the entire system, make sure you have an
+nVidia GPU and that you have installed the Linux nVidia drivers.
+You could still proceed with the next few steps even if you are missing the Linux nVidia drivers, as the system will run but with the CUDA-based perception and other modules.
+```
+# To get a list of build commands
+./apollo.sh
+# To make sure you start clean
+./apollo.sh clean
+# This will build the full system and requires that you have an nVidia GPU with nVidia drivers loaded
+bash apollo.sh build
+```
+
+If you do not have an nVidia GPU, the system will run but with the CUDA-based perception and other modules. You must
+specify either `dbg` for debug mode or `opt` for optimized code
+
+```
+./apollo.sh build_no_perception dbg
+```
+
+If you make modifications to the Dreamview frontend, then you must run `./apollo.sh build_fe`  before you run the
+full build.
+
+If the computer is very slow, you can enter the following command to limit the CPU.
+
+```
+bash apollo.sh build --local_resources 2048,1.0,1.0
+```
+
+
+## Run Apollo
+
+Follow the steps below to launch Apollo. Note that you must build the system first before you run it. Note that the
+bootstrap.sh will actually succeed but the user interface will not come up if you skip the build step.
+
+### Start Apollo
+
+Running Apollo will start the ROS core and then startup a web user interface called Dreamview, this is handled by
+the bootstrap script, so from within the docker container, you should run:
+
+```
+# start module monitor
+bash scripts/bootstrap.sh
+```
+
+### Access Dreamview
+Access Dreamview by opening your favorite browser, e.g. Chrome, go to http://localhost:8888 and you should see this screen
+However, there will be nothing running in the system.
+
+![Access Dreamview](docs/demo_guide/images/apollo_bootstrap_screen.png)
+
+### Select Drive Mode
+From the dropdown box selet "Navigation" mode.
+
+![Navigation Mode](docs/demo_guide/images/dreamview_2_5_setup_profile.png)
+
+
+### Replay demo rosbag
+
+To see if the system works, use the demo 'bag' which feeds the system.
+
+```
+# get rosbag note that the command download is required
+python ./docs/demo_guide/rosbag_helper.py demo_2.5.bag
+
+# You can now replay this demo "bag" in a loop with the '-l' flag
+rosbag play -l demo_2.5.bag
+```
+
+Dreamview should show a running vehicle now. (The following image might be different due to changes in frontend.)
+
+![Dreamview with Trajectory](docs/demo_guide/images/dv_trajectory_2.5.png)