Update README.md

Author: gminn

README.md

@@ -1,3 +1,50 @@
 # Platformio project for an ESP32 using ESP-IDF
 
-Under construction!
+This is a sample project for integrating Memfault with a PlatformIO project using the ESP-IDF framework.
+
+## Setup
+
+1. Install PlatformIO CLI using the instructions [here](https://docs.platformio.org/en/latest//core/installation.html#super-quick-mac-linux).
+
+2. Initialize Memfault submodule:
+
+```bash
+git submodule update --init
+```
+
+3. Activate the PlatformIO virtual env
+
+```bash
+source ~/.platformio/penv/bin/activate
+```
+
+4. Install Memfault's dependencies
+
+```bash
+pip install -r src/memfault/memfault-firmware-sdk/requirements.txt
+pip install memfault-cli
+```
+
+## Testing
+
+1. Build with the platformio CLI:
+    
+```bash
+pio run
+```
+    
+2. Upload the symbol file to Memfault:
+    
+```bash
+memfault \
+--org-token $MEMFAULT_AUTH_TOKEN \
+--org $MEMFAULT_ORG_SLUG \
+--project $MEMFAULT_PROJECT_SLUG \
+upload-mcu-symbols .pio/build/espidf/firmware.elf
+```
+
+3. Flash the device and start the serial monitor
+
+```bash
+pio run --target upload --target monitor
+```