Add license and readme

README.md

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+# RISC-V Cat
+
+An implementation of the GNU `cat` command in pure RISC-V assembly.
+No AI was used in the making of this program.
+
+## Building (Linux):
+
+Install the assembler and linker: `sudo apt install gcc-riscv64-linux-gnu`
+
+Run the `make` command in the root of the repository.
+
+## Usage
+
+`cat [OPTION]... [FILE]...`
+
+Options:
+`-h, --help` - Show a help page.