📝 added documentation

doc/examples/json_pointer__operator_add.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON pointer
+    json::json_pointer ptr("/foo");
+    std::cout << ptr << '\n';
+
+    // apppend a JSON Pointer
+    ptr /= json::json_pointer("/bar/baz");
+    std::cout << ptr << '\n';
+
+    // append a string
+    ptr /= "fob";
+    std::cout << ptr << '\n';
+
+    // append an array index
+    ptr /= 42;
+    std::cout << ptr << std::endl;
+}

doc/examples/json_pointer__operator_add.link

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+<a target="_blank" href="https://wandbox.org/permlink/9GFummh9iBAkOFiL"><b>online</b></a>

doc/examples/json_pointer__operator_add.output

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+"/foo"
+"/foo/bar/baz"
+"/foo/bar/baz/fob"
+"/foo/bar/baz/fob/42"

doc/examples/json_pointer__operator_add_binary.cpp

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+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON pointer
+    json::json_pointer ptr("/foo");
+
+    // apppend a JSON Pointer
+    std::cout << ptr / json::json_pointer("/bar/baz") << '\n';
+
+    // append a string
+    std::cout << ptr / "fob" << '\n';
+
+    // append an array index
+    std::cout << ptr / 42 << std::endl;
+}

doc/examples/json_pointer__operator_add_binary.link

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+<a target="_blank" href="https://wandbox.org/permlink/mxBfUH9gOY9AiOOk"><b>online</b></a>

doc/examples/json_pointer__operator_add_binary.output

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+"/foo/bar/baz"
+"/foo/fob"
+"/foo/42"