chore: added article skeletons for opencl and pocl

knowledge base/opencl.md

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+# OpenCL™
+
+Open Computing Language is an open, royalty-free standard for cross-platform, parallel programming of diverse accelerators found in supercomputers, cloud servers, personal computers, mobile devices and embedded platforms.
+
+## Table of contents <!-- omit in toc -->
+
+1. [Implementations](#implementations)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## Implementations
+
+- [PoCL]
+
+## Further readings
+
+- [Website]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+<!-- project's references -->
+[website]: https://www.khronos.org/opencl/
+
+<!-- internal references -->
+[further readings]: #further-readings
+[pocl]: pocl.md
+
+<!-- external references -->

knowledge base/pocl.md

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+# PoCL
+
+PoCL is a portable open source implementation of the 1.2 OpenCL standard.
+
+Upstream PoCL currently supports various CPUs, NVIDIA GPUs via libcuda, HSA-supported GPUs and TCE ASIPs (experimental, see: OpenASIP).
+
+PoCL uses Clang as an OpenCL C frontend and LLVM for kernel compiler implementation, and as a portability layer.
+
+## Table of contents <!-- omit in toc -->
+
+1. [Further readings](#further-readings)
+
+## Further readings
+
+- [Website]
+- [OpenCL]
+
+<!-- project's references -->
+[website]: http://portablecl.org/
+
+<!-- internal references -->
+[further readings]: #further-readings
+[opencl]: opencl.md
+
+<!-- external references -->