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README: Clarify that HCL is just syntax 

The readme was previously unclear about the fact that HCL is not a configuration language in itself but rather a toolkit for defining and parsing configuration languages.

It may still not be totally clear, but it is hopefully clearer than it was.
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Martin Atkins 2018-01-27 10:28:15 -08:00 committed by GitHub
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@ -1,8 +1,9 @@
# HCL
HCL is a structured configuration language that is both human- and
machine-friendly, for use with command-line tools. Although intended to be
generally useful, it is primarily targeted towards devops tools, servers, etc.
HCL is a toolkit for creating structured configuration languages that are
both human- and machine-friendly, for use with command-line tools.
Although intended to be generally useful, it is primarily targeted
towards devops tools, servers, etc.
HCL has both a _native syntax_, intended to be pleasant to read and write for
humans, and a JSON-based variant that is easier for machines to generate
@ -16,6 +17,12 @@ It includes an expression syntax that allows basic inline computation and,
with support from the calling application, use of variables and functions
for more dynamic configuration languages.
HCL provides a set of constructs that can be used by a calling application to
construct a configuration language. The application defines which attribute
names and nested block types are expected, and HCL parses the configuration
file, verifies that it conforms to the expected structure, and returns
high-level objects that the application can use for further processing.
## Experimental HCL2
This repository contains the experimental version 2 of HCL. This new version