Add Print Keyword

Print-Keyword.md

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+# Print
+
+Keyword: `print` (or `stdout`)
+
+Syntax: `print $str`
+
+Time Complexity:
+
+## Overview
+The `print` keyword appends its argument to stdout.
+
+## Example usage
+This program prints "Hello, world!" to the terminal
+```py
+print "Hello, world!"
+```
+
+# Println
+
+Keyword: `println` (or `stdlnout`)
+
+Syntax: `println $str`
+
+Time Complexity:
+
+## Overview
+The `println` keyword appends its argument to stdout, then flushes the buffer.
+
+## Example usage
+This program prints "Hello, world!" and flushes the terminal
+```py
+println "Hello, world!"
+```