clarify sai-js relation to solid community server

Author: elf-pavlik

Implementations.md

@@ -8,7 +8,7 @@
 
 | Name | Contact | License | Client | Server |
 |------|---------|---------|--------|--------|
-| [sai-js](https://sai.js.org) | [@elf-pavlik](https://github.com/elf-pavlik) | MIT | 🟢 | 🟡 |
+| [sai-js](https://sai.js.org) | [@elf-pavlik](https://github.com/elf-pavlik) | MIT | 🟢 | 🟡 [^1] |
 |      |         |         |        |        |
 
 ## Features
@@ -25,3 +25,8 @@
 | Name | Client | Server |
 |------|--------|--------|
 | sai-js | 💡| 💡|
+
+
+## Interested
+
+[^1]: sai-js server is implemented as custom components for [Community Solid Server](https://communitysolidserver.github.io/CommunitySolidServer/)