Add initial cargo crate layout. (#3)

* Add initial cargo crate layout.

This change applies the basic repository layout discussed in

Fixes #1

* Extend Cargo.toml with more info

.gitignore

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+target/
+Cargo.lock

Cargo.toml

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+[workspace]
+members = [
+    "opentracing-api",
+    "opentracing-noop",
+    "opentracing-mock"
+]

opentracing-api/Cargo.toml

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+[package]
+name = "opentracing-api"
+version = "0.1.0" # remember to update html_root_url
+authors = ["The OpenTracing Developers"]
+license = "Apache-2.0"
+homepage = "http://opentracing.io"
+repository = "https://github.com/opentracing/opentracing-rust"
+description = "OpenTracing API for Rust"
+documentation = "https://docs.rs/opentracing-api"
+keywords = ["opentracing", "tracing"]
+
+[badges]
+maintenance = { status = "actively-developed" }

opentracing-api/src/lib.rs

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+#![doc(html_root_url = "https://docs.rs/opentracing-api/0.1.0")]

opentracing-mock/Cargo.toml

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+[package]
+name = "opentracing-mock"
+version = "0.1.0" # remember to update html_root_url
+authors = ["The OpenTracing Developers"]
+license = "Apache-2.0"
+homepage = "http://opentracing.io"
+repository = "https://github.com/opentracing/opentracing-rust"
+description = "A OpenTracing Mock Tracer"
+documentation = "https://docs.rs/opentracing-mock"
+keywords = ["opentracing", "tracing"]
+
+[badges]
+maintenance = { status = "actively-developed" }

opentracing-mock/src/lib.rs

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+#![doc(html_root_url = "https://docs.rs/opentracing-mock/0.1.0")]

opentracing-noop/Cargo.toml

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+[package]
+name = "opentracing-noop"
+version = "0.1.0" # remember to update html_root_url
+authors = ["The OpenTracing Developers"]
+license = "Apache-2.0"
+homepage = "http://opentracing.io"
+repository = "https://github.com/opentracing/opentracing-rust"
+description = "A OpenTracing Noop Tracer"
+documentation = "https://docs.rs/opentracing-noop"
+keywords = ["opentracing", "tracing"]
+
+[badges]
+maintenance = { status = "actively-developed" }

opentracing-noop/src/lib.rs

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+#![doc(html_root_url = "https://docs.rs/opentracing-noop/0.1.0")]