Added info about OpenCL C into README (#589)

Author: AnastasiaStulova

README.adoc

@@ -14,7 +14,7 @@ Dependencies>>.
 == Introduction
 
 This repository contains the source and tool chain used to generate the
-formal OpenCL API, OpenCL Extensions, OpenCL SPIR-V Environment, and
+formal OpenCL API, OpenCL C, OpenCL Extensions, OpenCL SPIR-V Environment,
 OpenCL C++ Specifications, as well as the OpenCL 2.2 Reference Pages
 and documentation for the C++ for OpenCL kernel language.
 
@@ -51,6 +51,8 @@ We intend to maintain a linear history on the GitHub `master` branch.
 | `katex/`              | KaTeX math renderer for HTML outputs
 | `OpenCL_API.txt`      | Main source file for the OpenCL API Specification
 | `api/`                | Individual sections of the API Specification
+| `OpenCL_C.txt`        | Main source file for the OpenCL C Specification
+| `c/`                  | Individual sections of the C Specification
 | `OpenCL_Cxx.txt`      | Main source file for the OpenCL C++ Specification
 | `cxx/`                | Individual sections of the C++ Specification
 | `OpenCL_Env.txt`      | Main source file for the OpenCL SPIR-V Environment Specification
@@ -84,6 +86,10 @@ for each Specification:
 | apihtml        | HTML outputs for API Specification
 | apipdf         | PDF outputs for API Specification
 |                |
+| c              | HTML and PDF outputs for C Specification
+| chtml          | HTML outputs for C Specification
+| cpdf           | PDF outputs for C Specification
+|                |
 | cxx            | HTML and PDF outputs for C++ Specification
 | cxxhtml        | HTML outputs for C++ Specification
 | cxxpdf         | PDF outputs for C++ Specification