Add README note.

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-Project created for passing Operating Systems subject in High School of Information Technology
\ No newline at end of file
+Project created for passing Operating Systems subject in
+High School of Information Technology
+
+
+Example usages
+--------------
+
+Without bootstrap
+=================
+
+In separate terminals enter:
+$ ./bin/process1
+$ ./bin/process2
+$ ./bin/process3
+
+After that in terminal with process1 running enter some characters followed by
+new line (ENTER).
+
+- Process1 displays information about data buffer and how many bytes has been
+  sent to process2.
+- Process2 displays information about received bytes, prints to stderr info
+  about number of characters in buffer, and sent this value to process3.
+- Process3 displays information about number of entered characters.
+