Add TOC to readme

README.md

@@ -1,3 +1,48 @@
+- [Purpose](#purpose)
+- [Overall System Design](#overall-system-design)
+  * [Concept of Operation](#concept-of-operation)
+  * [Control Box](#control-box)
+    + [Logic Diagram](#logic-diagram)
+    + [Power Diagram](#power-diagram)
+  * [Actuator Box](#actuator-box)
+    + [Logic Diagram](#logic-diagram-1)
+    + [Power Diagram](#power-diagram-1)
+- [Physical Design](#physical-design)
+  * [Control Box](#control-box-1)
+    + [Display PCB](#display-pcb)
+      - [3D Render](#3d-render)
+      - [PCB Design](#pcb-design)
+      - [Schematic](#schematic)
+    + [Main PCB](#main-pcb)
+      - [3D Render](#3d-render-1)
+      - [PCB Design](#pcb-design-1)
+      - [Schematic](#schematic-1)
+    + [Integrated Assembly](#integrated-assembly)
+  * [Actuator Box](#actuator-box-1)
+    + [Actuator PCB](#actuator-pcb)
+      - [3D Render](#3d-render-2)
+      - [PCB Design](#pcb-design-2)
+      - [Schematic](#schematic-2)
+        * [Full Schematic](#full-schematic)
+        * [Non-Latching Relay Schematic](#non-latching-relay-schematic)
+        * [Latching Relay Schematic](#latching-relay-schematic)
+        * [Igniter Relay Schematic](#igniter-relay-schematic)
+    + [Integrated Assembly](#integrated-assembly-1)
+- [Arduino Software](#arduino-software)
+  * [Common Software](#common-software)
+    + [CAN Comms](#can-comms)
+  * [Control Box](#control-box-2)
+    + [Logic Diagram](#logic-diagram-2)
+    + [Custom LCD Class](#custom-lcd-class)
+    + [LED Groups Based on Relay Type](#led-groups-based-on-relay-type)
+      - [Non-Latching Relay Display](#non-latching-relay-display)
+      - [Latching Relay Display](#latching-relay-display)
+      - [Latching Solenoid Display](#latching-solenoid-display)
+  * [Actuator Box](#actuator-box-2)
+- [System Upgrades After Initial Design](#system-upgrades-after-initial-design)
+  * [Servo Motor Main Valve for Throttling](#servo-motor-main-valve-for-throttling)
+  * [MODBUS TCP Communication for Integration in Ignition SCADA](#modbus-tcp-communication-for-integration-in-ignition-scada)
+
 # Purpose
 The Texas A&M Sounding Rocketry Team designs, builds, and flies its own hybrid rocket. 
 As part of its design cycle, static cold flows and static engine tests are performed to chacterize the engine's oxidizer tank,