update README

README.md

@@ -1,8 +1,67 @@
 nf7
 ====
 
-node-based programming language
+portable visual programming platform
+
+## REQUIREMENTS
+
+- **OS**: Windows 10, Linux, and Chrome OS
+- **CPU**: x86_64
+- **GPU**: OpenGL 3.3 or higher (except Intel HD Graphics)
+- **RAM**: 512 MB or more (depends on what you do)
+- **Storage**: 100 MB or more (depends on what you do)
+
+## INSTALLING
+
+Build Nf7 by yourself, or download the binary from releases (unavailable on mirror repo).
+
+It's expected to copy and put the executable on each of your projects to prevent old works from corruption by Nf7's update.
+
+## BUILDING
+
+### Succeeded Environments
+
+- Windows 10 / CMake 3.20.21032501-MSVC_2 / cl 19.29.30137
+- Arch Linux / CMake 3.24.2 / g++ 12.2.0
+- Ubuntu (Chrome OS) / CMake 3.18.4 / g++ 10.2.1
+
+### Windows
+
+```
+PS> mkdir build
+PS> cd build
+PS> cmake ..  # add build options before the double dots
+PS> cmake --build . --config Release
+```
+
+### Linux
+
+```
+$ mkdir build
+$ cd build
+$ cmake -DCMAKE_BUILD_TYPE=Release ..  # add build options before the double dots
+$ make
+```
+
+### CMake build options
+|name|default|description|
+|--|--|--|
+| `NF7_STATIC` | `ON` | links all libraries statically |
+| `NF7_SANITIZE_THREAD` | `OFF` | enables thread-sanitizer (g++ only) |
+| `NF7_SANITIZE` | `OFF` | enables address/undefined/leak sanitizers (g++ only) |
+| `NF7_PROFILE` | `OFF` | enables Tracy features |
+
+The following condition must be met:
+```
+!(NF7_SANITIZE_THREAD && NF7_SANITIZE) &&  // address-sanitizer cannot be with thread-sanitizer
+!(NF7_SANITIZE_THREAD && NF7_PROFILE)      // TracyClient causes error because of thread-sanitizer
+```
+
+## DEPENDENCIES
+
+see `thirdparty/CMakeLists.txt`
 
 ## LICENSE
 
-WTFPLv2
+Do What The Fuck You Want To Public License v2  
+*-- expression has nothing without the real free --*