build(ninja): add ninja support

- Added ninja build support
- Updated readme

.gitignore

@@ -68,6 +68,35 @@ build
 # Clang
 .cache
 
+# clangd
+/.clangd/
+/compile_commands.json
+/.cache/
+
+# Ninja output
+.ninja_deps
+.ninja_log
+
+*.pyc
+*.obj
+*.ilk
+/build*/
+/build.ninja
+/ninja
+/ninja.bootstrap
+/build_log_perftest
+/canon_perftest
+/clparser_perftest
+/depfile_parser_perftest
+/hash_collision_bench
+/ninja_test
+/manifest_parser_perftest
+/graph.png
+/doc/manual.html
+/doc/doxygen
+*.patch
+.DS_Store
+
 
 input.txt
 output.txt