add project documentation

doc/build.md

@@ -0,0 +1,35 @@
+# webfuse build instructions
+
+## Build
+
+````
+cmake -B build
+cmake --build build
+sudo cmake --install build
+````
+
+## Build options
+
+| Options            | Default  | Description |
+| ------------------ | -------- | ----------- |
+| WITHOUT_PROVIDER   | OFF      | Disables build of webfuse provider |
+| WITHOUT_TEST       | OFF      | Disables build of unit and integration tests |
+| WITHOUT_CLANG_TIDY | OFF      | Disables running clang tidy on build |
+
+## Dependencies
+
+- [libfuse](https://github.com/libfuse/libfuse)
+- [libwebsockets](https://libwebsockets.org/)
+
+### Optional dependencies
+
+- [googletest](https://github.com/google/googletest)
+- [valgrind](https://valgrind.org/)
+- [clang-tidy](https://clang.llvm.org/extra/clang-tidy/)
+
+## Additional cmake targets
+
+| Target   | Description |
+| -------- | ----------- |
+| test     | runs unit and integration tests |
+| memcheck | runs unit test with valgrind/memcheck |