first commit

third_party/nlohmann/README.md

@@ -0,0 +1,15 @@
+a header-only json library from github: https://github.com/nlohmann/json, easy to use like working in Python.
+
+**NOTE**
+
+used for parse/dump json payload when interact with REST API from mLLM service in VideoPipe.
+
+
+```
+compile test:
+g++ json_test.cpp -o json_test -O2
+
+and run:
+./json_test
+
+```