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feat: add typescript solution to lc problem: No.0208.Implement Trie (Prefix Tree)

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	`1`	`+class TrieNode {`
	`2`	`+ children;`
	`3`	`+ isEnd;`
	`4`	`+ constructor() {`
	`5`	`+ this.children = new Array(26);`
	`6`	`+ this.isEnd = false;`
	`7`	`+ }`
	`8`	`+}`
	`9`	`+`
	`10`	`+class Trie {`
	`11`	`+ root;`
	`12`	`+ constructor() {`
	`13`	`+ this.root = new TrieNode();`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ insert(word: string): void {`
	`17`	`+ let head = this.root;`
	`18`	`+ for (let char of word) {`
	`19`	`+ let index = char.charCodeAt(0) - 97;`
	`20`	`+ if (!head.children[index]) {`
	`21`	`+ head.children[index] = new TrieNode();`
	`22`	`+ }`
	`23`	`+ head = head.children[index];`
	`24`	`+ }`
	`25`	`+ head.isEnd = true;`
	`26`	`+ }`
	`27`	`+`
	`28`	`+ search(word: string): boolean {`
	`29`	`+ let head = this.searchPrefix(word);`
	`30`	`+ return head != null && head.isEnd;`
	`31`	`+ }`
	`32`	`+`
	`33`	`+ startsWith(prefix: string): boolean {`
	`34`	`+ return this.searchPrefix(prefix) != null;`
	`35`	`+ }`
	`36`	`+`
	`37`	`+ private searchPrefix(prefix: string) {`
	`38`	`+ let head = this.root;`
	`39`	`+ for (let char of prefix) {`
	`40`	`+ let index = char.charCodeAt(0) - 97;`
	`41`	`+ if (!head.children[index]) return null;`
	`42`	`+ head = head.children[index];`
	`43`	`+ }`
	`44`	`+ return head;`
	`45`	`+ }`
	`46`	`+}`

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