Fixing cheatsheet.md namespace documentation

cheatsheet.md

@@ -129,6 +129,27 @@ chai.register_namespace(math, "math");
 ```
 
 Namespaces are imported to make them available for scripting
+
+```
+chai.import("math"); // importing via C++ (_not generally recommended_)
+```
+
+```
+import("math") // importing via ChaiScript (_recommended_)
+print(math.pi) // prints 3.14159
+```
+
+### Delayed Namespace Generation
+
+Passing a lambda function that returns a namespace will delay the namespace generation until `import` is called.  
+This saves memory and computing costs if a namespace is not imported into every ChaiScript instance.
+```
+chai.register_namespace([]() {
+    chaiscript::Namespace math;
+    math["pi"] = chaiscript::const_var(3.14159);
+    math["sin"] = chaiscript::var(chaiscript::fun([](const double x) { return sin(x); }));
+    return math; },
+    "math");
 ```
 
 # Using STL