Finished basic README.md

README.md

@@ -70,4 +70,47 @@ String fmt = 'const io from @%ccore/io%c;%cString fmt = %c%s%c;%clet @main in {%
 let @main in {
 	io.outf(fmt,39,39,10,39,fmt,39,10,10,9,10,10);
 }
+```
+
+## Documentation
+
+More documentation is available at [Documentation](docs/Documentation.md).
+
+## Building
+First, install the required packages. (ninja is required only for the quick build, you can use other build systems (like GNU Make) for the manual build)
+
+Debian/Ubuntu:
+`# apt install cmake ninja-build llvm-dev`
+
+CentOS/Fedora/RHEL: `# dnf install cmake ninja-build llvm-devel`
+
+Arch: `# pacman -S cmake ninja llvm-libs`
+
+Then, you can either use the quick-build script or do a manual build.
+
+Quick build: `./build.sh`
+
+Manual build first-time setup: 
+```
+mkdir build
+cd build
+cmake ..
+```
+
+Then, every time you want to build:
+```
+cd build
+cmake --build .
+```
+
+## Running
+The compiler is built at `build/sapphirec`.
+
+A few example commands:
+```
+$ build/sapphirec --version # prints the compiler version
+$ build/sapphirec --help # shows usage
+$ build/sapphirec main.sp # compiles a file
+$ build/sapphirec main.sp -o main # compiles a file with output filename
+$ build/sapphirec main.sp -o main --msystem darwin # compiles a file for macOS
 ```