Create shared library build

This project is intended to be distributed as a shared library that can be called from other languages, this will require building and producing an `so`, `dll` and `dylib` artifact for linux, windows and mac respectively. To achieve this the `C` library needs to be imported at the top of the codebase and an empty main function must be provided;
```go
import "C"

func main() {}
```
Any methods being made available for external calls in the shared library must be annotated with an export comment;
```go
// export Parse
func Parse(input string) map[string]string {
//...
```

Once this is done separate build processes will need to be created to run in github actions;
**Linux**
```sh
go build -o libscry.so -buildmode=c-shared main.go
```
**Windows**
```sh
go build -o libscry.dll -buildmode=c-shared main.go
```
**MacOS**
```sh
go build -o libscry.dylib -buildmode=c-shared main.go
```

These will be bundled up into a release so the relevant artifact can be brought into the user's codebase like this;
**Java**
```java
import com.sun.jna.Native;

//...
GoLibrary goLib = Native.load("libscry", GoLibrary.class);
goLib.Parse("t:instant c:b");
```
**C#**
```cs
[DllImport("libscry.dll")]
public static extern int Parse(string x);

//...
Parse("t:instant c:b");
```

Start by locating main.go and the current Parse entry point, then run the listed go build commands to verify the shared-library targets. Define GitHub Actions processes for Linux, Windows, and macOS, and confirm that the resulting .so, .dll, and .dylib artifacts are bundled into a release.

Written by the indexing model from the issue text.