added string docs in python (#2623)

content/roadmaps/108-python/content/100-python-basics/106-string-methods.md

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+# String Methods
+
+Python does not have a character data type, a single character is simply a string with a length of 1. Square bracket can be used to access elements of the string.
+There are methods which can be used on a string to best utilize it's wide range of functionalities. 
+Below Given resources can be utilised to learn more about them.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='red' badgeText='Watch' href='https://www.youtube.com/watch?v=Ctqi5Y4X-jA&t=11s'>Practical String Methods applications</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/python/python_ref_string.asp'>Comprehensive Study of String methods</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.geeksforgeeks.org/string-slicing-in-python/'>String Slicing in Python</BadgeLink>