Update SourceLayout.md

Author: yadij

docs/Features/SourceLayout.md

@@ -83,7 +83,8 @@ Key:
 | :frowning:         | :frowning:         | :frowning:         | :frowning:         | :neutral_face:     | repl/heap/       | HEAP Replacement Policy algorithms                                                                 |
 | :frowning:         | :frowning:         | :frowning:         | :frowning:         | :neutral_face:     | repl/lru/        | Cache Replacement Policy algorithms                                                                |
 | :neutral_face:     | :heavy_check_mark: | :frowning:         | :heavy_check_mark: | :heavy_check_mark: | sbuf/            | SBuf (string buffer) components and related algorithms                                             |
-| :frowning:         | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | security/        | Transport Layer Security components                                                                |
+| :frowning:         | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | security/        | Transport Layer Security components |
+| :frowning:         | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | security/sspi/        | Windows Security Support Provider Interface |
 | :frowning:         | :frowning:         | :frowning:         | :heavy_check_mark: | :neutral_face:     | servers/         | Listening Server components for receiving connections                                              | client_side*                                                                      |
 | :frowning:         | :frowning:         | :frowning:         | :heavy_check_mark: | :neutral_face:     | snmp/            | SNMP components                                                                                    | snmp_*, move core and agent code. restructure for extensibility.                  |
 | :frowning:         | :heavy_check_mark: | :frowning:         | :frowning:         | :neutral_face:     | ssl/             | OpenSSL components                                                                                 | library is named libsslsquid.la and matchgin stub_lib*.cc                         |