add CI and update README with CI, codecov, license

Author: qkniep

.travis.yml

@@ -0,0 +1,39 @@
+language: rust
+
+sudo: required
+
+rust:
+  - stable
+  - beta
+  - nightly
+
+matrix:
+  allow_failures:
+    - rust: nightly
+
+cache: cargo
+
+before_install:
+  - sudo apt-get update
+
+addons:
+  apt:
+    packages:
+      - libcurl4-openssl-dev
+      - libelf-dev
+      - libdw-dev
+      - cmake
+      - gcc
+      - binutils-dev
+
+before_script: |
+  if [[ "$TRAVIS_RUST_VERSION" == stable ]]; then
+    cargo install cargo-tarpaulin
+  fi
+
+after_success: |
+  if [[ "$TRAVIS_OS_NAME" == "linux" && "$TRAVIS_RUST_VERSION" == "stable" ]]; then
+    cargo tarpaulin --out Xml --lib -v
+    bash <(curl -s https://codecov.io/bash) &&
+    echo "Uploaded code coverage"
+  fi

README.md

@@ -1,2 +1,10 @@
-# regexpp-rs
-Rust port of regexpp (ECMAScript regular expression parser)
+# `regexpp-rs`
+
+[![Build Status](https://img.shields.io/travis/qkniep/regexpp-rs?logo=travis)](https://travis-ci.org/qkniep/regexpp-rs)
+[![codecov](https://codecov.io/gh/qkniep/regexpp-rs/branch/master/graph/badge.svg)](https://codecov.io/gh/qkniep/regexpp-rs)
+![LoC](https://tokei.rs/b1/github/qkniep/regexpp-rs?category=code)
+![License](https://img.shields.io/github/license/qkniep/regexpp-rs)
+
+Rust port of regexpp (ECMAScript regular expression parser).
+This crate is being developed mainly as an efficient validator of ECMAScript regular expressions for
+the [`deno_lint` project](https://github.com/denoland/deno_lint).