Clean up and document project files (#4560)

docs/mkdocs/docs/examples/basic_json__moveconstructor.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json a = 23;
+
+    // move contents of a to b
+    json b(std::move(a));
+
+    // serialize the JSON arrays
+    std::cout << a << '\n';
+    std::cout << b << '\n';
+}