Add samples for TR-502MSV remote socket controller

tests/tr-502msv/README.md

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+# TR-502MSV remote socket controller
+
+The controller uses 433.92MHz frequency, OOK modulation and PWM encoding.
+It can control 4 sockets with 4 pairs of on/off buttons. There are 2 additional
+pairs of buttons - all on/off and brightness button dim/bright. Reset button
+in the battery compartment can be used to change device id. For further
+details see [the manual](tr502msv_rc710_manual.pdf).
+
+Flex decoder:  
+`-X 'n=tr502msv,m=OOK_PWM,s=740,l=1400,t=70,r=84000'`
+
+## Data structure
+The data packet is repeated up to 4 times and comprises 21 bits:  
+`PIIIIIII IIIIISSS OCRUU`
+  - P: 1-bit preamble
+  - I: 12-bit device id
+  - S: 3-bit socket id
+  - O: 1-bit on/off
+  - C: 1-bit command - brightness/switch
+  - R: 1 reserved bit (always 0)
+  - U: 2 unknown bits, most likely a checksum
+
+Sockets map to the socket ids as follows:
+| Socket | Socket id |
+| ------ | --------- |
+|   1    |    000    |
+|   2    |    100    |
+|   3    |    010    |
+|   4    |    110    |
+|  all   |    111    |
+
+## Samples
+Directory `samples` contains captured samples whose names describe the
+corresponding action (e.g. socket2 off/on/dim/bright).