Added the four first days of 2015

Yes i'm gonna do them all !

Signed-off-by: Avior <github@avior.me>

2015/day-1/part-1.ts

@@ -0,0 +1,8 @@
+import fs from 'fs'
+
+const input = fs.readFileSync(__dirname + '/input.txt').toString()
+	.split('')
+
+console.log(
+	"Result:", input.reduce((p, c) => p + (c === '(' ? 1 : -1), 0)
+)

2015/day-1/part-2.ts

@@ -0,0 +1,19 @@
+import fs from 'fs'
+
+const input = fs.readFileSync(__dirname + '/input.txt').toString()
+	.split('')
+
+let v = 0
+for (let i = 0; i < input.length; i++) {
+	const item = input[i];
+	if (item === '(') {
+		v++
+		continue
+	}
+	if (--v < 0) {
+		console.log(
+			"Result:", i + 1
+		)
+		break
+	}
+}