moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

moved crates in lib/ to src/, renamed crates, modified some files' text (#660)

cranelift/serde/README.md

@@ -0,0 +1,32 @@
+This crate performs serialization of the [Cranelift](https://crates.io/crates/cranelift) IR.
+
+This crate is structured as an optional ability to serialize and deserialize cranelift IR into JSON
+format.
+
+Status
+------
+
+Cranelift IR can be serialized into JSON.
+
+Deserialize is a work in progress, as it currently deserializes into the serializable data structure
+that can be utilized by serde instead of the actual Cranelift IR data structure.
+
+
+Building and Using Cranelift Serde
+----------------------------------
+
+clif-json usage:
+
+    clif-json serialize [-p] <file>
+    clif-json deserialize <file>
+
+Where the -p flag outputs Cranelift IR as pretty JSON.
+
+For example to build and use clif-json:
+
+``` {.sourceCode .sh}
+cd cranelift-serde
+cargo build
+clif-json serialize -p test.clif
+```
+