add docs about SRFI

docs/docs/lips/SRFI.md

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+---
+sidebar_position: 8
+description: List of supported SRFI
+---
+
+# SRFI
+
+## Builtin SRFI
+
+This is a list of builin SRFI that don't require any action from user:
+
+| description | spec |
+| :--- | ---: |
+| Feature-based conditional expansion construct | [SRFI-0](https://srfi.schemers.org/srfi-0/) |
+| Homogeneous numeric vector datatypes | [SRFI-4](https://srfi.schemers.org/srfi-4/) |
+| Basic String Ports | [SRFI-6](https://srfi.schemers.org/srfi-6/) |
+| Running Scheme Scripts on Unix | [SRFI-22](https://srfi.schemers.org/srfi-22/) |
+| Error reporting mechanism | [SRFI-23](https://srfi.schemers.org/srfi-23/) |
+| Basic Format Strings | [SRFI-28](https://srfi.schemers.org/srfi-28/) |
+| Basic Syntax-rules Extensions | [SRFI-46](https://srfi.schemers.org/srfi-46/) |
+| An interface to access environment variables | [SRFI-98](https://srfi.schemers.org/srfi-98/) |
+| Syntax parameters | [SRFI-139](https://srfi.schemers.org/srfi-139/) |
+| Custom macro transformers | [SRFI-147](https://srfi.schemers.org/srfi-147/) |
+| Version flag | [SRFI-176](https://srfi.schemers.org/srfi-176/) |
+| Command line | [SRFI-193](https://srfi.schemers.org/srfi-193/) |
+
+## Included SRFI
+
+Those SRFI are included as files that can be loaded into LIPS Scheme system:
+
+| description | spec |
+| :--- | ---: |
+| List Library | [SRFI-1](https://srfi.schemers.org/srfi-1/) |
+| `AND-LET*`: an AND with local bindings, a guarded `LET*` special form | [SRFI-2](https://srfi.schemers.org/srfi-2/) |
+| receive: Binding to multiple values | [SRFI-8](https://srfi.schemers.org/srfi-8/) |
+| `#,` external form | [SRFI-10](https://srfi.schemers.org/srfi-10/) |
+| Notation for Specializing Parameters without Currying | [SRFI-26](https://srfi.schemers.org/srfi-26/) |
+| Basic hash tables | [SRFI-69](https://srfi.schemers.org/srfi-69/) |
+| Boxes | [SRFI-111](https://srfi.schemers.org/srfi-111/) |
+| Syntactic combiners for binary predicates | [SRFI-156](https://srfi.schemers.org/srfi-156/) |
+| Multiple-value boxes | [SRFI-195](https://srfi.schemers.org/srfi-195) |
+| Procedures and Syntax for Multiple Values | [SRFI-210](https://srfi.schemers.org/srfi-210/) |
+| Evaluating expressions in an unspecified order | [SRFI-236](https://srfi.schemers.org/srfi-236) |
+
+On the Web you can use this code to load above SRFI:
+
+```scheme
+(load "https://cdn.jsdelivr.net/npm/@jcubic/lips@beta/lib/srfi/<NUMBER>.scm")
+```
+
+In NodeJS you can use this code:
+
+```scheme
+(load "<LIPS PATH>/lib/srfi/<number>.scm")
+```
+
+## Future plans
+
+On devel branch there is a way to load those SRFI with `@lips` marker instead of full path.
+The final version LIPS 1.0 will most likely include some mechanism to load SRFI as R7RS libraries.
+
+