Add license and readme

LICENSE

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+MIT License
+
+Copyright (c) 2026 Lexzach
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
+associated documentation files (the "Software"), to deal in the Software without restriction, including 
+without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
+following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial 
+portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
+LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
+EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+USE OR OTHER DEALINGS IN THE SOFTWARE.

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.