Adding some links to documentation

BUILD.md

@@ -1,9 +1,6 @@
 # Building instructions
 
-This is a detailed guide for building the firmware of MMDVM_HS from the source code. This
-software runs on STM32F103 microcontroller. You can build this code using Arduino IDE with
-STM32duino package, or using "make" with ARM GCC tools. Also, Arduino with 3.3 V I/O (Arduino
-Due and Zero) and Teensy (3.1, 3.2, 3.5 or 3.6) are supported.
+This is a detailed guide for building the firmware of MMDVM_HS from the source code. For quick instructions, please see [README.md](README.md). This software runs on STM32F103 microcontroller. You can build this code using Arduino IDE with STM32duino package, or using "make" with ARM GCC tools. Also, Arduino with 3.3 V I/O (Arduino Due and Zero) and Teensy (3.1, 3.2, 3.5 or 3.6) are supported.
 
 # Index
 

README.md

@@ -28,13 +28,13 @@ Be aware that some Blue Pill STM32F103 board are defectives. If you have trouble
 
 VHF (144-148 MHz) support for ZUMSpot is added by an external 18 nH inductor between L1 and L2 pins of ADF7021.
 
-Dual ADF7021 for full duplex operation (#define DUPLEX in Config.h) will work only with a big RX/TX frequency separation (5 MHz or more in UHF band for example) and proper antenna filtering. At the moment #define ADF7021_CARRIER_BOARD (Config.h) with STM32F103 platform is supported. Please see BUILD.md for pinout details.
+Dual ADF7021 for full duplex operation (#define DUPLEX in Config.h) will work only with a big RX/TX frequency separation (5 MHz or more in UHF band for example) and proper antenna filtering. At the moment #define ADF7021_CARRIER_BOARD (Config.h) with STM32F103 platform is supported. Please see [BUILD.md](BUILD.md) for pinout details.
 
 If you can't decode any 4FSK modulation (DMR, YSF and P25) with your ZUMspot, the common solution is to adjust RX frequency offset (RXOffset) in your MMDVM.ini file. Please try with steps of +-100 Hz until you get low BER. If you don't have test equipment, the only procedure is trial and error. In some cases TXOffset adjustment is also required for proper radio decoding.
 
 # Quick start
 
-Please see BUILD.md for more details, and also MMDVM Yahoo Groups. You also can check at MMDVM_HS/scripts folder for some automatic tasks.
+Please see [BUILD.md](BUILD.md) for more details, and also MMDVM Yahoo Groups. You also can check at MMDVM_HS/scripts folder for some automatic tasks.
 
 ## Binary firmware installation