Created Error handling (markdown)

Error-handling.md

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+SMNP language doesn't have any sophisticated error handling mechanism, however, you are still able to raise errors using `throw` statement.
+The `throw` construction is inspired by Java language, however instead of
+throwing exceptions SMNP language allows you only to throw string values.
+When control flow meet `throw` statement, program execution is immediately interrupted
+and Execution Error is raised with message passed to `throw` statement. 
+
+Example:
+```
+function divide(a: int, b: int) {
+    if (b == 0) {
+        throw "You are trying to divide by 0!";
+    }
+
+    return a / b;
+}
+```
+If you try to invoke e.g. `divide(2, 0)` the following error will be raised:
+```
+Error
+Source: /.../.../scratchpad.mus
+Position: line 10, column 15
+
+You are trying to divide by 0!
+
+Stack trace:
+[1] <root>::divide(int, int)
+[0] <root>::<entrypoint>()
+```
+
+SMNP language does not support any equivalent of `try-catch` statements known from
+other languages. Because the SMNP is not aimed at building complex systems
+and there is simply no need to implement sophisticated error handling system
+in simple music, you are actually unable to implement more advanced multi-layer 
+error handling system.