pliron 0.4.0

Programming Languages Intermediate RepresentatiON
Documentation 
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# Programming Languages Intermediate RepresentatiON

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`pliron` is an extensible compiler IR framework, inspired by [MLIR](https://mlir.llvm.org/docs/LangRef/)
and written in safe Rust.

## Build and Test
* Install the [rust toolchain](https://www.rust-lang.org/tools/install).
* `cargo build` and `cargo test` should build the compiler and run the testsuite.
* To see a simple IR constructed (by the [print_simple](tests/ir_construct.rs) test),
  use the following command:

      cargo test print_simple -- --show-output

  It should print something like:
  ```mlir
  builtin.module @bar {
    ^block_1v1():
      builtin.func @foo: builtin.function<() -> (builtin.int<si64>)> {
        ^entry_block_2v1():
          c0_op_3v1_res0 = test.constant builtin.integer <0x0: builtin.int<si64>>;
          test.return c0_op_3v1_res0
      }
  }
  ```

* `pliron` provides an [`llvm-opt` tool](pliron-llvm/README.md) that
can parse LLVM-IR bitcode into the LLVM dialect and output LLVM-IR
bitcode.

## Using the Library
`pliron` is currently in a nascent stage and not yet useful for
real-world use. In the future it can be used by just adding
a dependence to the [crate](https://crates.io/crates/pliron)
in your Rust project.

## Documentation
* Introduction and motivation are covered in the [introductory wiki article](https://github.com/vaivaswatha/pliron/wiki/Introduction).
* The wiki also has a [comparison](https://github.com/vaivaswatha/pliron/wiki/Comparison-with-other-compiler-frameworks) of `pliron`
with other compiler projects, touching upon some design decisions.
* Code documentation can be found on
  [docs.rs](https://docs.rs/pliron/latest/pliron/).