Add usage example

AUTHORS

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+David Adrian <[email protected]>

README.md

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 # cchannel
 Golang-style channels for C++
+
+### Origins
+
+This was used internally by some [Censys](https://censys.io)-related code. This
+is a dump of the code with some minor changes so that it's usable outside of
+Censys.
+
+### Building
+
+Easiest is to just copy both source files in the build system for your project.
+If this is popular, at some point, I might add a Makefile to this repository
+for testing purposes, but for now I'm just supplying the code as is.
+
+### Usage
+
+Dummy example asynchronously processes a vector, and writes the output to a
+file.
+
+```cpp
+Channel<std::string> to_write;
+std::fstream output_file("output.txt");
+
+// Write output to a file as it comes through the queue
+std::thread output_thread([&]() {
+    for (auto it = to_write.range(); it.valid(); ++it) {
+        if (it->size() > 0) {
+            output_file << *it;
+        }
+    }
+    output_file.flush();
+});
+
+// Read input and send through queue
+std::vector<Object> input_data = get_input();
+for (const auto& obj : input_data) {
+    // Do some work
+    std::string = do_something(obj);
+
+    // Sending releases ownership
+    to_write.send(std::move(s));
+}
+
+output_thread.join();
+```
+
+### Support
+
+I'll take pull requests, but I'm not going to provide much other support.
+