Reorganize directories (#3462)

* 🚚 move files
* 🚚 rename doc folder to docs
* 🚚 rename test folder to tests

tests/src/fuzzer-driver_afl.cpp

@@ -0,0 +1,38 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 3.10.5
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a driver for American Fuzzy Lop (afl-fuzz). It relies on
+an implementation of the `LLVMFuzzerTestOneInput` function which processes a
+passed byte array.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <vector>    // for vector
+#include <cstdint>   // for uint8_t
+#include <iostream>  // for cin
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
+
+int main()
+{
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    while (__AFL_LOOP(1000))
+    {
+#endif
+        // copy stdin to byte vector
+        std::vector<uint8_t> vec;
+        char c;
+        while (std::cin.get(c))
+        {
+            vec.push_back(static_cast<uint8_t>(c));
+        }
+
+        LLVMFuzzerTestOneInput(vec.data(), vec.size());
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    }
+#endif
+}