Add program errors (#2380)

* created programmer error file

* Update content/roadmaps/107-nodejs/content/103-nodejs-error-handling/103-error-types/ProgrammerError.md

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/107-nodejs/content/103-nodejs-error-handling/103-error-types/ProgrammerError.md

@@ -0,0 +1,3 @@
+# Programmer Errors
+
+Programmer errors are bugs and should be dealt with in our code. they can always be avoided by changing some line(s) of code. Examples of such errors are; when a String is passed where an Object was expected, trying to read a property that is “undefined”, called an asynchronous function without a callback, and so on.