Merge pull request #3 from rust-lang-nursery/add-readme

Add README.md

Author: steveklabnik

.travis.yml

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+language: rust
+
+cache: cargo
+
+rust:
+  - nightly
+
+before_script:
+  - (cargo install mdbook --git https://github.com/azerupi/mdBook.git --force || true)
+
+script: /home/travis/.cargo/bin/mdbook test;

README.md

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+# The Rustonomicon
+
+The Dark Arts of Advanced and Unsafe Rust Programming
+
+Nicknamed "the Nomicon."
+
+## NOTE: This is a draft document, and may contain serious errors
+
+> Instead of the programs I had hoped for, there came only a shuddering blackness
+and ineffable loneliness; and I saw at last a fearful truth which no one had
+ever dared to breathe before — the unwhisperable secret of secrets — The fact
+that this language of stone and stridor is not a sentient perpetuation of Rust
+as London is of Old London and Paris of Old Paris, but that it is in fact
+quite unsafe, its sprawling body imperfectly embalmed and infested with queer
+animate things which have nothing to do with it as it was in compilation.
+
+This book digs into all the awful details that are necessary to understand in
+order to write correct Unsafe Rust programs. Due to the nature of this problem,
+it may lead to unleashing untold horrors that shatter your psyche into a billion
+infinitesimal fragments of despair.
+
+### Requirements
+
+Building the Nomicon requires [mdBook]. To get it:
+
+[mdBook]: https://github.com/azerupi/mdBook
+
+```bash
+$ cargo install mdbook
+```
+
+### Building
+
+To build the Nomicon:
+
+```bash
+$ mdbook build
+```
+
+The output will be in the `book` subdirectory. To check it out, open it in
+your web browser.
+
+_Firefox:_
+```bash
+$ firefox book/index.html                       # Linux
+$ open -a "Firefox" book/index.html             # OS X
+$ Start-Process "firefox.exe" .\book\index.html # Windows (PowerShell)
+$ start firefox.exe .\book\index.html           # Windows (Cmd)
+```
+
+_Chrome:_
+```bash
+$ google-chrome book/index.html                 # Linux
+$ open -a "Google Chrome" book/index.html       # OS X
+$ Start-Process "chrome.exe" .\book\index.html  # Windows (PowerShell)
+$ start chrome.exe .\book\index.html            # Windows (Cmd)
+```
+
+To run the tests:
+
+```bash
+$ mdbook test
+```
+
+## Contributing
+
+Given that the Nomicon is still in a draft state, we'd love your help! Please feel free to open
+issues about anything, and send in PRs for things you'd like to fix or change. If your change is
+large, please open an issue first, so we can make sure that it's something we'd accept before you
+go through the work of getting a PR together.