Docs. Add info about lcr console tool

doc/appsFeatures/apps-featured/lcr_meter/lcr_meter.rst

@@ -127,3 +127,54 @@ the user expects some value in creating ranges, then the Manual mode can be used
     - Min, Max, Average measurements  
     - 1000 logging points   
 
+*******************
+Console application
+*******************
+
+Lcr meter can be used from console.
+
+.. code-block:: console
+
+   root@rp-f01c35:~# lcr
+   Too few arguments!
+
+   LCR meter version 0.00-0000, compiled at Fri Aug 14 03:29:10 2020
+
+   Usage:	lcr [freq] [r_shunt] 
+
+      freq               Signal frequency used for measurement [ 100 , 1000, 10000 , 100000 ] Hz.
+      r_shunt            Shunt resistor value in Ohms [ 10, 100, 1000, 10000, 100000, 1000000 ]. If set to 0, Automatic ranging is used.
+                        Automatic ranging demands Extenson module.
+
+   Output:	Frequency [Hz], |Z| [Ohm], P [deg], Ls [H], Cs [F], Rs [Ohm], Lp [H], Cp [F], Rp [Ohm], Q, D, Xs [H], Gp [S], Bp [S], |Y| [S], -P [deg]
+
+
+For run the lcr, you need to do 23 steps:
+
+    #. ) Load the FPGA image of streaming
+
+        .. code-block:: console
+
+            root@rp-f07167:/# cat /opt/redpitaya/fpga/fpga_0.94.bit > /dev/xdevcfg
+
+    #. ) Launch a console application.
+
+        .. code-block:: console
+
+            root@rp-f01c35:~# lcr 100 100000 -v
+            Frequency       100 Hz
+            Z       5.424000 kOmh
+            Phase   1.364216 deg
+            L(s)    205.533997 mH
+            C(s)    -12.324000 uF
+            R(s)    5.422000 kOmh
+            L(p)    0.000000 H
+            C(p)    0.000000 F
+            R(p)    5.425000 kOmh
+            Q       0.023815
+            D       -41.991112
+            X_s     129.141129
+            G_p     0.000184
+            B_p     0.000000
+            |Y|     0.000184
+            -P_Y    -1.364216 deg