Add constructor to SlicedByteArray and update version to 0.2.6

Introduce a new constructor in `SlicedByteArray` for initializing from a ByteArray. Updated `build.gradle.kts` to bump the version to 0.2.6, and made minor adjustments to `readme.md` to improve clarity and consistency.

src/commonMain/kotlin/nl/astraeus/tba/SlicedByteArray.kt

@@ -8,6 +8,8 @@ class SlicedByteArray(
   val size: Int
     get() = length
 
+  constructor(array: ByteArray) : this(array, 0, array.size)
+
   constructor(size: Int) : this(ByteArray(size), 0, size)
 
   operator fun get(index: Int): Byte {