quad: change "modular_quad_pid" to "real_quad"

quad/README.md

-# Quadcopter
+# Quadcopter Section
 
-The quad/ directory contains all code that programs the quadcopter. This
-includes any C libraries we have written, any HDL to program the Zybo on
+This `quad/` directory contains all code that programs the quadcopter,
+including any C libraries we have written, any HDL to program the Zybo on
 the quad, and the XSDK main project that runs on the Zybo.
 
 The main quad application is written as a library, and located at:
 ```
-src/quad_app/quad_app.c
+src/quad_app (main function in quad_app.c)
 ```
 
 The main XSDK project that actually runs on the Zybo is located at:
 ```
-xsdk_workspace/modular_quad_pid/main.c
+xsdk_workspace/real_quad
 ```
 
-## Building
+If you were wondering, we do have the complementary virtual quad easy testing:
+```
+src/virt_quad
+```
 
-### Libraries
+## Building our Libraries
 
 To build the libraries:
 ```
@@ -29,31 +32,21 @@ directories:
 cd src/<project> && make
 ```
 
-### XSDK Project
-
-To build the XSDK project that runs on the Zybo (only works on co3050):
-```
-make zybo
-```
-
-To build the Zybo boot image for the SD card (only works on co3050):
-```
-make boot
-```
-
-Disclaimer: The make boot target currently does not work
-
 ## Testing
 
-### Libraries
+We have split our code into 2 main sections: application code and hardware code.
+We did that so that we can write tests that run automatically on CI. You just
+can't run automatic tests on hardware code because the environments won't match.
 
-We try to write unit tests for the libraries we've written, since they are
-not tied to the Zybo platform and are able to be run in our CI environment.
+All CI tests are run using the following target:
 ```
 make test
 ```
 
-You can also run the test for specific library inside its respective project
+This incorporates unit tests (`src/<library>/test`), as well as a few functional
+test scripts (`scripts/tests`) that verify things on the virtual quad.
+
+You can also run the tests for a specific library inside its respective project
 directory:
 ```
 cd src/<project> && make test
@@ -61,6 +54,6 @@ cd src/<project> && make test
 
 ### XSDK Project
 
-The XSDK project implements the hardware interfaces used in the quad app.
-There are tests can be executed from the main function in that XSDK project.
-These tests essentially test each hardware interface.
+We have tests for the hardware-level code, they just have to be run manually.
+You can find these tests along with instructions at
+`xsdk_workspace/read_quad/src/hw_impl_zybo_tests.c`