Added a quick guide to embedding

embedding-toy.md

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+# Embedding Toy
+
+This tutorial assumes you're using git, GCC, and make.
+
+To embed toy into your program, simply clone the [git repository](https://github.com/Ratstail91/Toy) into a submodule - here we'll assume you called it `Toy`.
+
+Toy's makefile uses the variable `TOY_OUTDIR` to define where the output of the build command will place the result. You MUST set this to a value, relative to the Toy directory.
+
+```make
+export LIBDIR = lib
+export TOY_OUTDIR = ../$(LIBDIR)
+```
+
+Next, you'll want to run make the from within Toy's `source`, assuming the output directory has been created. There are two options for building Toy - `library` (default) or `static`; the former will create a shared library (and a .dll file on windows), while the latter will create a static library.
+
+```make
+toy: $(LIBDIR)
+	$(MAKE) -C Toy/source
+
+$(LIBDIR):
+	mkdir $(LIBDIR)
+```
+
+Finally, link to the outputted library, and specify the source directory to access the header files.
+
+```make
+all: $(OBJ)
+	$(CC) $(CFLAGS) -o $(OUT) $(OBJ) -L../$(LIBDIR) $(LIBS)
+```
+
+Here's a quick example makefile template you can use:
+
+```make
+CC=gcc
+
+export OUTDIR = out
+export LIBDIR = lib
+export TOY_OUTDIR = ../$(LIBDIR)
+
+IDIR+=. ./Toy/source
+CFLAGS+=$(addprefix -I,$(IDIR))
+LIBS+=-ltoy
+
+ODIR=obj
+SRC=$(wildcard *.c)
+OBJ=$(addprefix $(ODIR)/,$(SRC:.c=.o))
+
+OUT=./$(OUTDIR)/program
+
+all: toy $(OUTDIR) $(ODIR) $(OBJ)
+	$(CC) $(CFLAGS) -o $(OUT) $(OBJ) -L$(LIBDIR) $(LIBS)
+	cp $(LIBDIR)/*.dll $(OUTDIR) # for shared libraries
+
+toy: $(LIBDIR)
+	$(MAKE) -C Toy/source
+
+$(OUTDIR):
+	mkdir $(OUTDIR)
+
+$(LIBDIR):
+	mkdir $(LIBDIR)
+
+$(ODIR):
+	mkdir $(ODIR)
+
+$(ODIR)/%.o: %.c
+	$(CC) -c -o $@ $< $(CFLAGS)
+```