Create README.md

README.md

+# Event loop and worker thread
+
+Usage:
+
+    cd build
+    cmake ..
+    cmake --build .
+    ./eventloop
+
+The Workers class has two constructors. The default constructor (no arguments) returns an instance utilising a single thread,
+or rather, it runs one task at a time in the order the tasks were added to the queue. This makes the instance act as an event loop.
+
+The other constructor takes one argument, giving the number of concurrent threads to use. Order of execution is not guaranteed.
+
+The `post_timeout([](), int timeout)` method is nonblocking, and places the task in a separate queue before adding it to the main
+queue after the timeout.