Update External Libraries

External-Libraries.md

@@ -10,7 +10,7 @@ Our ground syntax will be `call !Example_GreetUser $username &greet`
 ## C code
 First, import `groundext.h`. Then, start a new function. For our example, we will call it `greetUser`.
 ```c
-#include "groundext.h"
+#include <groundext.h>
 
 GroundValue greetUser(GroundScope* scope, List args) {
     
@@ -19,7 +19,7 @@ GroundValue greetUser(GroundScope* scope, List args) {
 To create our function, we need to access our arguments. Use `args.values[idx]` for an argument. `args.values[0]` is the first argument, `args.values[1]` is the second argument, etc.
 
 ```c
-#include "groundext.h"
+#include <groundext.h>
 
 GroundValue greetUser(GroundScope* scope, List args) {
     const char* argument = args.values[0].data.stringVal;
@@ -30,7 +30,7 @@ The function expects us to return a `GroundValue`. After we create our string, w
 All together, we can write our function like this:
 
 ```c
-#include "groundext.h"
+#include <groundext.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -51,7 +51,7 @@ void ground_init(GroundScope* scope) {
 ```
 For our example, it would look something like this:
 ```c
-#include "groundext.h"
+#include <groundext.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -90,3 +90,13 @@ println $out # Prints "Hello, DiamondNether90!"
 ## Best practices
 - Namespacing is done with an underscore (`libName_FunctionName`).
 - Use camelCase for the library name and PascalCase for the function name.
+
+## Throwing Errors
+
+If your library encounters an error during execution, you can throw an error with the ERROR() macro. The syntax is this:
+
+```c
+ERROR("Friendly description of how the error happened", "ErrorCode");
+```
+
+The `ErrorCode` is what users of your library will be able to catch errors with. If the error is not caught, the friendly description will be shown to the user.