Update value.h.md

Wrote documentation for functions found in the value.h file.

doc/api/value.h.md

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+### mrb_float_value
+```C
+static inline mrb_value mrb_float_value(struct mrb_state *mrb, mrb_float f)
+```
+
+Returns a float in Ruby.
+
+##### Example
+
+In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument 
+and what class the passed in value is. In this case we are passing in mrb_float f = 0.09. Alternatively 
+double i = 0.09 could also be used.
+
+
+example.c
+```C
+#include <stdio.h>
+#include <mruby.h>
+#include "mruby/compile.h"
+#include "mruby/string.h"
+
+int
+main(void)
+{
+  mrb_float f = 0.09;// or double i = 0.09;
+  mrb_state *mrb = mrb_open();
+  if (!mrb) { /* handle error */ }
+  FILE *fp = fopen("test.rb","r");
+  mrb_value obj = mrb_load_file(mrb,fp);
+  mrb_funcall(mrb, obj, "method_name", 1, mrb_float_value(mrb, f));
+  fclose(fp);
+  mrb_close(mrb);
+}
+
+```
+
+test.rb
+```Ruby
+class My_Class
+	def method_name(s)
+		puts s
+		puts s.class
+	end
+end
+a = My_Class.new
+```
+
+### mrb_fixnum_value
+
+```C
+static inline mrb_value mrb_fixnum_value(mrb_int i)
+```
+
+Returns a fixnum in Ruby.
+
+##### Example
+
+In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument 
+and what class the passed in value is. In this case we are passing in mrb_int i = 99. Alternativly int i = 99
+could also be used.
+
+
+example.c
+```C
+#include <stdio.h>
+#include <mruby.h>
+#include "mruby/compile.h"
+
+int
+main(void)
+{
+  mrb_int i = 99; // or int i = 99;
+  mrb_state *mrb = mrb_open();
+  if (!mrb) { /* handle error */ }
+  FILE *fp = fopen("test.rb","r");
+  mrb_value obj = mrb_load_file(mrb,fp);
+  mrb_funcall(mrb, obj, "method_name", 1, mrb_fixnum_value(i));
+  fclose(fp);
+  mrb_close(mrb);
+}
+
+```
+
+test.rb
+```Ruby
+class My_Class
+	def method_name(s)
+		puts s
+		puts s.class
+	end
+end
+a = My_Class.new
+```
+
+
+
+### mrb_nil_value
+
+```C
+static inline mrb_value mrb_nil_value(void)
+```
+
+Returns nil in Ruby.
+
+##### Example
+
+In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument 
+and what class the passed in value is. In this case we are passing in nothing and we will get NillClass.
+
+
+example.c
+```C
+#include <stdio.h>
+#include <mruby.h>
+#include "mruby/compile.h"
+
+int
+main(void)
+{
+  mrb_state *mrb = mrb_open();
+  if (!mrb) { /* handle error */ }
+  FILE *fp = fopen("test.rb","r");
+  mrb_value obj = mrb_load_file(mrb,fp);
+  mrb_funcall(mrb, obj, "method_name", 1, mrb_nil_value());
+  fclose(fp);
+  mrb_close(mrb);
+}
+
+```
+
+test.rb
+```Ruby
+class My_Class
+	def method_name(s)
+		puts s
+		puts s.class
+	end
+end
+a = My_Class.new
+```
+
+
+### mrb_false_value
+
+```C
+static inline mrb_value mrb_false_value(void)
+```
+
+Returns false in Ruby.
+
+##### Example
+
+In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument 
+and what class the passed in value is. In this case we are passing in nothing and we will get FalseClass.
+
+
+example.c
+```C
+#include <stdio.h>
+#include <mruby.h>
+#include "mruby/compile.h"
+
+int
+main(void)
+{
+  mrb_state *mrb = mrb_open();
+  if (!mrb) { /* handle error */ }
+  FILE *fp = fopen("test.rb","r");
+  mrb_value obj = mrb_load_file(mrb,fp);
+  mrb_funcall(mrb, obj, "method_name", 1, mrb_false_value());
+  fclose(fp);
+  mrb_close(mrb);
+}
+
+```
+
+test.rb
+```Ruby
+class My_Class
+	def method_name(s)
+		puts s
+		puts s.class
+	end
+end
+a = My_Class.new
+```
+
+
+
+### mrb_true_value
+
+```C
+static inline mrb_value mrb_true_value(void)
+```
+
+Returns true in Ruby.
+
+##### Example
+
+In this example we read from a Ruby file inside C. The Ruby code will print what you pass as an argument 
+and what class the passed in value is. In this case we are passing in nothing and we will get TrueClass.
+
+
+example.c
+```C
+#include <stdio.h>
+#include <mruby.h>
+#include "mruby/compile.h"
+
+int
+main(void)
+{
+  mrb_state *mrb = mrb_open();
+  if (!mrb) { /* handle error */ }
+  FILE *fp = fopen("test.rb","r");
+  mrb_value obj = mrb_load_file(mrb,fp);
+  mrb_funcall(mrb, obj, "method_name", 1, mrb_true_value());
+  fclose(fp);
+  mrb_close(mrb);
+}
+
+```
+
+test.rb
+```Ruby
+class My_Class
+	def method_name(s)
+		puts s
+		puts s.class
+	end
+end
+a = My_Class.new
+```