Update COMMON_ISSUES.md (#918)

COMMON_ISSUES.md

@@ -4,6 +4,43 @@
 
 <!-- markdownlint-disable MD031 -->
 
+## Simple Troubleshooting
+
+When troubleshooting, users can start with the included gettingStarted
+sketch as it contains all the info needed to troubleshoot an RF24 radio.
+
+1. If `radio.begin()` returns false, the MCU and radio are not "talking"
+successfully with each other. Verify pin connections and wiring.
+2. If `radio.begin()` returns true, but the devices are not communicating,
+users can uncomment the lines `printf_begin()` & `radio.printDetails()` and
+ view the settings. They should appear as the following:
+
+ ```
+ SPI Speedz = 10 Mhz
+ STATUS = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
+ RX_ADDR_P0-1 = 0x65646f4e31 0x65646f4e32
+ RX_ADDR_P2-5 = 0x33 0xce 0x3e 0xe3
+ TX_ADDR = 0x65646f4e31
+ RX_PW_P0-6 = 0x04 0x04 0x04 0x04 0x04 0x04
+ EN_AA = 0x3f
+ EN_RXADDR = 0x02
+ RF_CH = 0x4c
+ RF_SETUP = 0x03
+ CONFIG = 0x0f
+ DYNPD/FEATURE = 0x00 0x00
+ Data Rate = 1 MBPS
+ Model = nRF24L01+
+ CRC Length = 16 bits
+ PA Power = PA_LOW
+ ARC = 0
+ ```
+ If the settings do not appear as above, troubleshoot wiring, pin
+ connections, etc.
+
+3. If both of the above check out, the problem is likely in software or 
+even hardware issues (bad radios etc.) See the following.
+
+
 ## Settings that must match
 
 Before you report undesirable behavior, please make sure that the