Overview added (#284)

* Overview added

* Updates after feedback.

Author: KeilChris

ARM.CMSIS-DSP.pdsc

@@ -2,7 +2,7 @@
 
 <package schemaVersion="1.7.40" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="https://raw.githubusercontent.com/Open-CMSIS-Pack/Open-CMSIS-Pack-Spec/v1.7.40/schema/PACK.xsd">
   <name>CMSIS-DSP</name>
-  <description overview="README.md">CMSIS Embedded Compute Library</description>
+  <description overview="overview/README.md">CMSIS Embedded Compute Library</description>
   <vendor>ARM</vendor>
   <license>LICENSE</license>
   <licenseSets>

overview/README.md

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+# Overview
+
+CMSIS-DSP is an optimized compute library for embedded systems (DSP is in the name for legacy reasons). It provides
+optimized compute kernels for Arm Cortex-M and for Cortex-A. Different variants are available according to the core and
+most of the functions are using a vectorized version when the [Helium](https://developer.arm.com/Architectures/Helium)
+or [Neon](https://developer.arm.com/Architectures/Neon) extension is available.
+
+This CMSIS-Pack contains the CMSIS-DSP library.
+
+## CMSIS-DSP Kernels
+
+Kernels provided by CMSIS-DSP (list not exhaustive):
+
+- Basic mathematics (real, complex, quaternion, linear algebra, fast math functions)
+- DSP (filtering)
+- Transforms (FFT, MFCC, DCT)
+- Statistics
+- Classical ML (Support vector machine, distance functions for clustering ...)
+
+Kernels are provided with several data types: f64, f32, f16, q31, q15, q7.
+
+## Links
+
+- [Documentation](https://arm-software.github.io/CMSIS-DSP)
+- [Examples](https://github.com/ARM-software/CMSIS-DSP/tree/main/Examples)
+- [Repository](https://github.com/ARM-software/CMSIS-DSP)
+- [Issues](https://github.com/ARM-software/CMSIS-DSP/issues)