Added README.md for test folder

tests/README.md

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+# Test scripts
+
+Python scripts used for sensor reading, configuring and automated testing. All scripts assume that 485 converter device file is `/dev/rs485`.
+
+## User scripts
+
+Following scripts are meant to be used by user for sensor search, read and config (write).
+
+### `find_device.py`
+
+Search for device over all combinations of given baudrates and addresses. If no arguments are given, script tries all possible combinations (which takes really long time).
+
+Usage:
+
+```
+./find_device.py [ -a [{FIRST_ADDR-LAST_ADDR | ADDR} ...] ] [ -b [BAUD ...]]
+```
+
+Examples:
+
+```
+Complete search (slow!):
+	./find_device.py
+Look for devices 123,10,56 at baudrates 19200,115200:
+	./find_device.py -a 123 10 56 -b 19200 115200
+Look for devices 10-55 at baudrate 19200:
+	./find_device.py -a 10-55 -b 19200
+Look for device 1-10 and 55 at baudrate 115200:
+	./find_device.py -a 1-10 55 -b 115200
+Look for device 1-10 at all possible baudrates:
+	./find_device.py -a 1-10 55
+
+```
+
+### `query_device.py`
+
+Script for interaction with sensor. Allows reading from input register and read/write access to holding registers.
+
+Usage:
+
+```
+./query_device.py ADDR [BAUDRATE] [{read [REGISTER ...] | write VALUE REGISTER}]
+where:
+    - ADDR is Modbus address (use 0 for broadcast; note that only write can be broadcast)
+    - BAUDRATE is (optional) baud rate; default value is 19200
+    - action can be "read", "write" or can be omitted (defaults to "read all")
+    - REGISTER can be either human-friendly register name (e.g. "CO2") or register number (30001)
+    - read may have list of REGISTER arguments (combining both register numbers and names)
+    - VALUE is 16-bit integer in decimal format
+    - to get list of human-friendly names just read all registers from sensor (run script with address only)
+
+EXAMPLES
+
+Read all registers from sensor 247, default baud rate:
+    ./query_device.py 247
+Read only CO2 register from sensor 123, baudrate 4800:
+    ./query_device.py 123 4800 read CO2
+Read CO2, T_SHT4x and RH_SCD4x from sensor 222, default baudrate:
+    ./query_device.py 222 read CO2 T_SHT4x RH_SCD4x
+Turn LED off for sensor 247, baud 115200:
+    ./query_device.py 247 115200 write 0 LED_on_register
+Set brightness of all connected sensors to 50%:
+    ./query_device.py 0 write 50 LED_brightness_register
+```