Apps: readme added

Added readme describing sample applications

apps/README.md

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+
+# Sample applications
+
+## advertiser
+
+This is the simplest example of advertising. Application sets NRPA, configures
+advertisement parameters: general discoverable and not connectable and fills
+advertisement fields. Transmited data contains only flags, tx power level and
+device name, which fits in 31B limit of single package. With this data set,
+device advertises for 10 seconds, terminates advertisement and repeats process
+again infinitely.
+
+## scanner
+
+This application shows how to perform simple scan. Device performs discovery
+procedure, during which receives advertising reports (if any devices are
+advertising nearby). These reports are being parsed and results are printed to
+serial port. Applicaton starts new discovery every second.
+
+## peripheral
+
+Peripheral application is based on advertiser, but has added capability of
+connecting with other devices. As peripheral, device doesn't initiate any
+connection by itself; instead, advertises infinitely and accepts any connection
+request it receives. Because we cannot use any 16 or 32 bit UUIDs, as these are
+reserved by Bluetooth SIG, we are forced to use 128-bit one. Including such
+long UUID in advertising data consumes large part of available payload, so this
+data is split in advertising data and response data.
+
+## central
+
+This application works in pair with peripheral. It's based on scanner
+application - the difference is, that if there was detected device with UUID
+fitting to the one predefined in central application, connection is initiated.