Add recipes

recipes/wip/net/download/curlio/recipe.toml

+#TODO not compiled or tested
+[source]
+git = "https://github.com/Kei-K23/curlio"
+[build]
+template = "cargo"

recipes/wip/tools/diffutils-rs/recipe.toml

+#TODO not compiled or tested
+[source]
+git = "https://github.com/uutils/diffutils"
+[build]
+template = "cargo"

recipes/wip/tools/findutils-rs/recipe.toml

+#TODO not compiled or tested
+[source]
+git = "https://github.com/uutils/findutils"
+[build]
+template = "cargo"