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Added question "What is an index in a database?" (#88)

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* add index question in DB section

Co-authored-by: Abdelrahman Badreldeen <abdelrahman.badreldeen@scratchpay.com>
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@ -8897,6 +8897,13 @@ A single data source (at least usually) which is stored in a raw format.
<summary>What is OLAP (Online Analytical Processing)?</summary><br><b>
</b></details>
<details>
<summary>What is an index in a database?</summary><br><b>
A database index is a data structure that improves the speed of operations in a table. Indexes can be created using one or more columns, providing the basis for both rapid random lookups and efficient ordering of access to records.
</b></details>
## Regex
Given a text file, perform the following exercises