doc: add README and gitignore

.gitignore

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+*.wasm
+*.out
+wai
+

README.md

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+# WAI
+> WebAssembly Interpreter
+
+## Usage
+
+Dependencies: wat2wasm from [wabt](https://github.com/WebAssembly/wabt/tree/main)
+
+```sh
+make 
+make tests
+./wai tests/factorial.wasw
+```
+
+## Resources
+
+- WebAssembly Specification [[Web](https://webassembly.github.io/spec/core/)] [[PDF](https://webassembly.github.io/spec/core/_download/WebAssembly.pdf)]
+- [wat2wasm online](https://webassembly.github.io/wabt/demo/wat2wasm/index.html)
+
+## License
+
+```
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+```