Add skeleton for wasi abi

lib/wasi/Cargo.toml

@@ -5,3 +5,4 @@ authors = ["The Wasmer Engineering Team <engineering@wasmer.io>"]
 edition = "2018"
 
 [dependencies]
+wasmer-runtime-core = { path = "../runtime-core", version = "0.2.1" }

lib/wasi/src/lib.rs

@@ -1 +1,18 @@
 
+use wasmer_runtime_core::{
+    import::ImportObject,
+    imports,
+    func,
+};
+
+pub fn generate_import_object() -> ImportObject {
+    imports! {
+        // This generates the wasi state.
+        || {
+            // returns (pointer to state, function that can destruct the state).
+        },
+        "wasi_unstable" => {
+            
+        },
+    }
+}