Add image blob and bitpix enum

src/Bitpix.php

@@ -0,0 +1,43 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Dumbastro\FitsPhp;
+
+/**
+* Valid BITPIX values
+*/
+enum Bitpix: int
+{
+    case Uint8 = 8;
+    case Uint16 = 16;
+    case Uint32 = 32;
+    case Uint64 = 64;
+    case Float32 = -32;
+    case Float64 = -64;
+
+    public function type(): string
+    {
+        return match($this) {
+            Bitpix::Uint8 => 'int8',
+            Bitpix::Uint16 => 'int16',
+            Bitpix::Uint32 => 'int32',
+            Bitpix::Uint64 => 'int64',
+            Bitpix::Float32 => 'float32',
+            Bitpix::Float64 => 'float64',
+        };
+    }
+
+    public function toString(): string
+    {
+        return match($this) {
+            Bitpix::Uint8 => 'Character or unsigned binary integer',
+            Bitpix::Uint16 => '16 bit two\'s complement binary integer',
+            Bitpix::Uint32 => '32 bit two\'s complement binary integer',
+            Bitpix::Uint64 => '64 bit two\'s complement binary integer',
+            Bitpix::Float32 => 'IEEE single-precision floating point',
+            Bitpix::Float64 => 'IEEE double-precision floating point',
+        };
+    }
+}
+