Enable .github/CODEOWNERS

@TheAlgorithms/go_maintainers The Go repo is now using [CODEOWNERS](https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/about-code-owners) which will automatically request a review when someone opens a (non-draft) pull request in a directory that you own.  So if you are interested in a particular directory then please @mention yourself after that directory.  This is voluntary but it should help us to do a divide-and-conquer on all these Hacktoberfest pull requests.

Author: cclauss

.github/CODEOWNERS

@@ -0,0 +1,19 @@
+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+
+/.*  @cclauss
+/ciphers/
+/data-structures/
+/dynamic-programming/
+/graphs/
+/math/
+/other/
+/searches/
+/sorts/
+/strings/ @Mystigan