adds exercise 1 - ch 7.0

Author: ishtms

Readme.md

@@ -255,5 +255,17 @@ The repo for our backend framework- [Velocy](https://github.com/ishtms/velocy)
 -   [Improving the `Router` API](/chapters/ch06.3-improving-the-router-api.md)
 -   [The need for a `trie`](/chapters/ch06.4-the-need-for-a-trie.md)
     -   [What is a `Trie` anyway?](/chapters/ch06.4-the-need-for-a-trie.md#what-is-a-trie-anyway)
+-   [Exercise - Implementing a `Trie`](/chapters/ch07.0-ex-implementing-a-trie.md#exercise---implementing-a-trie)
+    -   [Root Node](/chapters/ch07.0-ex-implementing-a-trie.md#root-node)
+    -   [End of the word](/chapters/ch07.0-ex-implementing-a-trie.md#end-of-the-word)
+    -   [Challenge 1: Basic Trie with `insert` Method](/chapters/ch07.0-ex-implementing-a-trie.md#challenge-1-basic-trie-with-insert-method)
+        -   [Requirements](/chapters/ch07.0-ex-implementing-a-trie.md#requirements)
+        -   [More details](/chapters/ch07.0-ex-implementing-a-trie.md#more-details)
+        -   [Solution](/chapters/ch07.0-ex-implementing-a-trie.md#solution)
+    -   [Challenge 2: Implement `search` method](/chapters/ch07.0-ex-implementing-a-trie.md#challenge-2-implement-search-method)
+        -   [Requirements](/chapters/ch07.0-ex-implementing-a-trie.md#requirements-1)
+        -   [More details](/chapters/ch07.0-ex-implementing-a-trie.md#more-details-1)
+        -   [Hints](/chapters/ch07.0-ex-implementing-a-trie.md#hints)
+        -   [Solution](#solution-1)
 
 ![](https://uddrapi.com/api/img?page=readme)