Trivial: Add documentation to applink module/dub.sdl

Author: Geod24

deimos/openssl/applink.d

@@ -1,4 +1,14 @@
+/**
+ * Glue between OpenSSL BIO and Win32 compiler run-time
+ *
+ * Duplicate the content of the `applink.c` source file
+ * to avoid linking it in user code without adding a dependency
+ * to a C build system/compiler.
+ *
+ * See_Also: https://www.openssl.org/docs/manmaster/man3/OPENSSL_Applink.html
+ */
 module deimos.openssl.applink;
+
 import core.stdc.stdio;
 import std.stdio : _fileno, _setmode, _O_BINARY;
 import core.sys.posix.fcntl;

dub.sdl

@@ -10,6 +10,8 @@ configuration "library" {
 	excludedSourceFiles "deimos/openssl/applink.d"
 }
 
+// Includes a module to replace `applink.c` as described in:
+// https://www.openssl.org/docs/manmaster/man3/OPENSSL_Applink.html
 configuration "library-applink" {
 	targetType "sourceLibrary"
 }