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feat: add swift implementation to lcof2 problem: No.098 (doocs#3503)

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Original file line number	Diff line number	Diff line change
`@@ -247,6 +247,30 @@ var uniquePaths = function (m, n) {`
`247`	`247`	`};`
`248`	`248`	```
`249`	`249`
	`250`	`+#### Swift`
	`251`	`+`
	`252`	+```swift
	`253`	`+class Solution {`
	`254`	`+ func uniquePaths(_ m: Int, _ n: Int) -> Int {`
	`255`	`+ var dp = Array(repeating: Array(repeating: 0, count: n), count: m)`
	`256`	`+ dp[0][0] = 1`
	`257`	`+`
	`258`	`+ for i in 0..<m {`
	`259`	`+ for j in 0..<n {`
	`260`	`+ if i > 0 {`
	`261`	`+ dp[i][j] += dp[i - 1][j]`
	`262`	`+ }`
	`263`	`+ if j > 0 {`
	`264`	`+ dp[i][j] += dp[i][j - 1]`
	`265`	`+ }`
	`266`	`+ }`
	`267`	`+ }`
	`268`	`+`
	`269`	`+ return dp[m - 1][n - 1]`
	`270`	`+ }`
	`271`	`+}`
	`272`	+```
	`273`	`+`
`250`	`274`	`<!-- tabs:end -->`
`251`	`275`
`252`	`276`	`<!-- solution:end -->`

Lines changed: 19 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,19 @@`
	`1`	`+class Solution {`
	`2`	`+ func uniquePaths(_ m: Int, _ n: Int) -> Int {`
	`3`	`+ var dp = Array(repeating: Array(repeating: 0, count: n), count: m)`
	`4`	`+ dp[0][0] = 1`
	`5`	`+`
	`6`	`+ for i in 0..<m {`
	`7`	`+ for j in 0..<n {`
	`8`	`+ if i > 0 {`
	`9`	`+ dp[i][j] += dp[i - 1][j]`
	`10`	`+ }`
	`11`	`+ if j > 0 {`
	`12`	`+ dp[i][j] += dp[i][j - 1]`
	`13`	`+ }`
	`14`	`+ }`
	`15`	`+ }`
	`16`	`+`
	`17`	`+ return dp[m - 1][n - 1]`
	`18`	`+ }`
	`19`	`+}`

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