chore: setup cbindgen to generate C Header

Inspired by PR at: Ciantic#54

.gitignore

@@ -8,4 +8,7 @@
 
 /examples
 
+# cbindgen generated header file:
+VirtualDesktopAccessor.h
+
 _*

dll/cbindgen.toml

@@ -0,0 +1,47 @@
+# See https://github.com/eqrion/cbindgen/blob/master/docs.md#cbindgentoml
+# for detailed documentation of every option here.
+
+# Initial version of this file is from https://github.com/Ciantic/VirtualDesktopAccessor/pull/54
+# Use this config to generate a C header by:
+# - Installing cbindgen: cargo install cbindgen
+# - Running it inside the "dll" folder: cbindgen --config cbindgen.toml --crate dll --output VirtualDesktopAccessor.h
+
+language = "C++"
+
+############## Options for Wrapping the Contents of the Header #################
+
+# header = "/* Text to put at the beginning of the generated file. Probably a license. */"
+# trailer = "/* Text to put at the end of the generated file */"
+include_guard = "VirtualDesktopAccessor_h"
+#pragma_once = true
+autogen_warning = "/* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */"
+include_version = true
+namespace = "VirtualDesktopAccessor"
+sys_includes = ["cstdint", "Windows.h"]
+includes = []
+no_includes = true
+after_includes = ""
+
+documentation_length = "short"
+line_endings = "CRLF"          # also "CR", "CRLF", "Native"
+
+style = "both"
+cpp_compat = true
+
+[defines]
+
+[export]
+include = []
+exclude = ["Lazy", "HWND", "GUID"]
+
+[fn]
+prefix = "__declspec(dllimport)"
+
+[parse]
+parse_deps = false
+clean = true
+
+[parse.expand]
+all_features = true
+default_features = true
+features = []