Wrote some tutorials

using-toy.md

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+# Using Toy
+
+This tutorial assumes that you've managed to embed Toy into your program by following the tutorial [Embedding Toy](embedding-toy).
+
+Here, we'll look at some ways in which you can utilize Toy's C API within your host program.
+
+Be ware that when you create a new Literal object, you must call `freeLiteral()` on it afterwards! If you don't, your program will leak memory as Toy has no internal tracker for such things.
+
+## Embedded API Macros
+
+The functions intended for usage by the API are prepended with the C macro `TOY_API`. The exact value of this macro can vary by platform, or even be empty. In addition, the macros defined in [literal.h](https://github.com/Ratstail91/Toy/blob/0.6.0/source/literal.h) are available for use when manipulating literals. These include:
+
+* `IS_*` - check if a literal is a specific type
+* `AS_*` - cast the literal to a specific type
+* `TO_*` - create a literal of a specific type
+* `IS_TRUTHY` - check if a literal is truthy
+* `MAX_STRING_LENGTH` - the maximum length of a string in Toy (can be altered if needed)
+
+## Structures Used Throughout Toy
+
+The main unit of data within Toy's internals is `Literal`, which can contain any value that can exist within the Toy langauge. The exact implementation of `Literal` may change or evolve as time goes on, so it's recommended that you only interact with literals directly by using the macros and functions outlined [above](#embedded-api-macros). See the [types](types) page for information on what datatypes exist in Toy.
+
+There are two main "compound structures" used within Toy's internals - the `LiteralArray` and `LiteralDictionary`. The former is an array of `Literal` instances stored sequentially in memory for fast lookups, while the latter is a key-value hashmap designed for efficient lookups based on a `Literal` key. These are both accessible via the language as well.
+
+These compound structures hold **copies** of literals given to them, rather than taking ownership of existing literals.
+
+## Compiling Toy Scripts
+
+Please see [Compiling Toy](compiling-toy) for more information on the process of turning scripts into bytecode.
+
+## Interpreting Toy
+
+The `Interpreter` structure is the beating heart of Toy - You'll usually only need one interpreter, as it can be reset as needed.
+
+The four basic functions are used as follows:
+
+```c
+//assume "tb" and "size" are the results of compilation
+Interpreter interpreter;
+
+initInterpreter(&interpreter);
+runInterpreter(&interpreter, tb, size);
+resetInterpreter(&interpreter); //You usually want to reset between runs
+freeInterpreter(&interpreter);
+```
+
+In addition to this, you might also wish to "inject" a series of usable libraries into the interpreter, which can be `import`-ed within the language itself. This process only needs to be done once, after initialization, but before the first run.
+
+```c
+injectNativeHook(&interpreter, "standard", hookStandard);
+```
+
+A "hook" is a callback function which is invoked when the given library is imported. `standard` is the most commonly used library available.
+
+```
+import standard;
+```
+
+Hooks can simply inject native functions into the current scope, or they can do other, more esoteric things (though this is not recommended).
+
+```c
+//a utility structure for storing the native C functions
+typedef struct Natives {
+	char* name;
+	NativeFn fn;
+} Natives;
+
+int hookStandard(Interpreter* interpreter, Literal identifier, Literal alias) {
+	//the list of available native C functions that can be called from Toy
+	Natives natives[] = {
+		{"clock", nativeClock},
+		{NULL, NULL}
+	};
+
+    //inject each native C functions into the current scope
+	for (int i = 0; natives[i].name; i++) {
+		injectNativeFn(interpreter, natives[i].name, natives[i].fn);
+	}
+
+	return 0;
+}
+```
+
+## Calling Toy from C
+
+In some situations, you may find it convenient to call a function written in Toy from the host program. For this, a pair of utility functions have been provided:
+
+```c
+TOY_API bool callLiteralFn(Interpreter* interpreter, Literal func, LiteralArray* arguments, LiteralArray* returns);
+TOY_API bool callFn       (Interpreter* interpreter, char* name,   LiteralArray* arguments, LiteralArray* returns);
+```
+
+The first argument must be an interpreter. The third argument is a pointer to a `LiteralArray` containing a list of arguments to pass to the function, and the fourth is a pointer to a `LiteralArray` where the return values can be stored (an array is used here for a potential future feature). The contents of the argument array is consumed and left in an indeterminate state (but is safe to free), while the returns array always has one value - if the function did not return a value, then it contains a `null` literal.
+
+The second arguments to these functions are either the function to be called as a `Literal`, or the name of the function within the interpreter's scope. The latter API simply finds the specified `Literal` if it exists and calls the former. As with most APIs, these return `false` if something went wrong.
+