Added readme

README.md

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+# ZigFunge98 : a Funge-98 interpreter written in zig
+
+This repository contains code for a zig program that can interpret a valid [Funge-98](https://github.com/catseye/Funge-98/blob/master/doc/funge98.markdown) program. It passes the [mycology test suite](https://github.com/Deewiant/Mycology).
+
+Current limitations are :
+- currently does not implement any fingerprints
+- does not implement concurrent execution with the `t` command
+- does not implement file I/O with the `i` and `o` commands
+- does not implement system execution with the `=` command
+
+## Contents
+
+- [Dependencies](#dependencies)
+- [Quick install](#quick-install)
+- [Usage](#usage)
+- [Building](#building)
+
+## Dependencies
+
+zig is required. Only zig version >= 0.9.0 on linux amd64 (Gentoo) is being regularly tested.
+
+## Quick Install
+
+To get, compile then install zigfunge98, do something like:
+```sh
+git clone https://git.adyxax.org/adyxax/zigfunge98
+cd zigfunge98
+zig build
+install ./zig-out/bin/zigfunge98 ~/.local/bin/
+```
+
+## Usage
+
+Launching zigfunge98 is as simple as :
+```sh
+zigfunge98 something.b98
+```
+
+The interpreter will load and execute the specified Funge-98 program until the program normally terminates or is interrupted or killed.
+
+## Building
+
+To run tests, use :
+```sh
+zig build test
+```
+
+To test the coverage, use:
+```sh
+zig build test -Dtest-coverage
+firefox kcov-output/index.html
+```
+
+For a non debug build, use either one of:
+```sh
+zig build -O ReleaseSafe
+zig build -O ReleaseSmall
+zig build -O ReleaseFast
+```