Update README.md

Add technical parameters.

README.md

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 ![SPACEDOS03A front  panel](/doc/img/SPACEDOS03.jpg)
 
 
-SPACEDOS03 is open-source semiconductor particle detector (dosimeter and spectrometer) for space applications. Detector is based on silicon PIN diode. The Detector is designed as autonomous for long-term measurement campaigns and therefore contains its own power source from high-capacity battery cells and a recording medium in the form of an industrial SD card. The device is designed to be able work for half a year continuously.
+SPACEDOS03 is an open-source semiconductor particle detector (dosimeter and spectrometer) for space applications. The detector is based on a silicon PIN diode. The Detector is designed as autonomous for long-term measurement campaigns and therefore contains its own power source from high-capacity battery cells and a recording medium in the form of an industrial SD card. The device is designed to be able to work for half a year continuously.
 
 The detector is mounted into a 3D printed box that contains spaces for passive TLDs and track detectors.
 
+## Parameters
+
+ * Silicon PIN diode detector with 12.5 mm³ detection volume
+ * Effective number of energy channels 470 ±3
+ * Deposited energy range from 60 keV to 7 MeV
+ * Energy measurement resolution 15 ±2 keV (depending on calibration method and type of particles)
+ * Power supply 18650 Li-ion cells
+ * Integration time depends on firmware setup 
+ * Data storage device: Industrial SLC SDcard
+ * Dimensions - 120 x 90 x 62 mm
+ * Weight - 447 grams (with SAFT batteries)
+
 
 * [Power module](https://github.com/ust-modules/UST5BATT18650V01)