Create README.md

Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>

numpy/dtype/README.md

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+# dtype
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## The goal
+
+A numpy matrix can have differnt dtype or -- in other words -- differnt types of numbers with different precisions. 
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+## Signed integer types​​
+
+**Please use numpy.int8, numpy.int16, numpy.int32, and numpy.int64 !!!**
+
+
+* *numpy.int8*: 8-bit signed integer (-128 to 127). Compatible with C char.​
+  * *numpy.byte*​
+  * Character code 'b'​
+
+* *numpy.int16*: 16-bit signed integer (-32 768 to 32 767). Compatible with C short​
+  * *numpy.short​*
+  * Character code 'h'​
+
+* *numpy.int32*: 32-bit signed integer (-2 147 483 648 to 2 147 483 647). Compatible with C int​
+
+  * *numpy.intc​*
+  * Character code 'i'​
+
+​* *numpy.int64*: 64-bit signed integer (-9 223 372 036 854 775 808 to 9 223 372 036 854 775 807). ​Compatible with Python int and C long​
+  * *numpy.intp​*
+  * *numpy.int_​*
+  * Character code 'l'​
+
+  *numpy.longlong*: Compatible with C long long ​
+  * Character code 'q'​
+
+​
+## Unsigned integer types​​
+
+**Please use numpy.uint8, numpy.uint16, numpy.uint32, and numpy.uint64 !!!​**
+
+* *numpy.uint8*: 8-bit unsigned integer (0 to 255). Compatible with C unsigned char.​
+  * *numpy.ubyte​*
+  * Character code 'B'​
+
+* *numpy.uint16*: 16-bit unsigned integer (0 to 65 535). Compatible with C unsigned short.​
+  * *numpy.ushort​*
+  * Character code 'H'​
+
+​* *numpy.uint32*: 32-bit unsigned integer (0 to 4 294 967 295). Compatible with C unsigned int.​
+  * *numpy.uintc​*
+  * Character code 'I'​
+
+​* *numpy.uint64*: 64-bit unsigned integer (0 to 18 446 744 073 709 551 615). Compatible with C unsigned long​
+  * numpy.uint​
+  * numpy.uintp​
+  * Character code 'L'​
+  * numpy.ulonglong: Compatible with C unsigned long long​
+  * Character code 'Q'
+
+
+​
+
+​
+
+​
+
+​