Mention the url dependency user param in the docs

website/docs/guides/dependencies.md

@@ -11,6 +11,12 @@ scala-cli compile Hello.scala \
   --dependency org.scala-lang.modules::scala-parallel-collections:1.0.4
 ```
 
+You can also add a URL fallback for a JAR dependency, if it can't be fetched otherwise:
+```bash
+scala-cli compile Hello.scala \
+  -- dependency "org::name::version,url=https://url-to-the-jar"
+```
+
 Note that `--dependency` is only meant as a convenience.
 You should favor adding dependencies in the sources themselves via [using directives](./guides/configuration.md#special-imports).
 <!-- TODO #344 

website/docs/guides/using-directives.md

@@ -109,7 +109,8 @@ The only exceptions are `using target` directives, which only apply to the given
 Below is a list of the most important `using` directives that Scala CLI supports. The full list can be found in the [Reference section of this documentation](./reference/directives.md).
 
 - `//> using scala "<scala-version>"` - defines version of Scala used
-- `//> using lib "org::name:version"` - defines dependency to given library [more in dedicated guide](./guides/dependencies.md)
+- `//> using lib "org::name:version"` - defines dependency to a given library [more in dedicated guide](./guides/dependencies.md)
+- `//> using lib "org::name:version,url=url"` - defines dependency to a given library with a fallback to its jar url
 - `//> using resourceDir "<dir>"` - marks directory as source of resources. Resources accessible at runtime and packaged together with compiled code.
 - ``//> using `java-opt` "<opt>"`` - use given java options when running application or tests
 - `//> using target ["test"|"main"]` used to marked or unmarked given source as test
@@ -171,4 +172,4 @@ In such cases we suggest to use triple `/` for single line comments, or use `//`
 */
 ```
 
-Generally, our recommendation is to not use keyword based directives until scala-cli will stop supporting plain comments-based directives.
+Generally, our recommendation is to not use keyword based directives until scala-cli will stop supporting plain comments-based directives.

website/docs/reference/dependency.md

@@ -12,4 +12,5 @@ sidebar_position: 4
 
 - second `:` — scala platform suffix
   - single `:` — no platform suffix
-  - double `::` — platform suffix, if any
+  - double `::` — platform suffix, if any
+- user parameters can be passed after a comma `,`

website/docs/reference/directives.md

@@ -42,13 +42,17 @@ Manually add JAR(s) to the class path
 
 Add dependencies
 
-`//> using lib "`_org_`:`name`:`ver"
+`//> using lib "`_org_`:`name`:`ver`"`
+
+`//> using lib "`_org_`:`name`:`ver`,url=`url`"`
 
 #### Examples
 `//> using lib "org.scalatest::scalatest:3.2.10"`
 
 `//> using lib "org.scalameta::munit:0.7.29"`
 
+`//> using lib "tabby:tabby:0.2.3,url=https://github.com/bjornregnell/tabby/releases/download/v0.2.3/tabby_3-0.2.3.jar"`
+
 ### Java home
 
 Sets Java home used to run your application or tests