Rewrite fzf in Go

src/README.md

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+fzf in Go
+=========
+
+This directory contains the source code for the new fzf implementation in Go.
+This new version has the following benefits over the previous Ruby version.
+
+- Immensely faster
+    - No GIL. Performance is linearly proportional to the number of cores.
+    - It's so fast that I even decided to remove the sort limit (`--sort=N`)
+- Does not require Ruby and distributed as an executable binary
+    - Ruby dependency is especially painful on Ruby 2.1 or above which
+      ships without curses gem
+
+Build
+-----
+
+```sh
+# Build fzf executable
+make
+
+# Install the executable to ../bin directory
+make install
+
+# Build executable for Linux x86_64 using Docker
+make linux64
+```
+
+
+Prebuilt binaries
+-----------------
+
+- Darwin x86_64
+- Linux x86_64
+
+Third-party libraries used
+--------------------------
+
+- [ncurses](https://www.gnu.org/software/ncurses/)
+- [mattn/go-runewidth](https://github.com/mattn/go-runewidth)
+    - Licensed under [MIT](http://mattn.mit-license.org/2013)
+- [mattn/go-shellwords](https://github.com/mattn/go-shellwords)
+    - Licensed under [MIT](http://mattn.mit-license.org/2014)
+
+Contribution
+------------
+
+For the moment, I will not add or accept any new features until we can be sure
+that the implementation is stable and we have a sufficient number of test
+cases. However, fixes for obvious bugs and new test cases are welcome.
+
+I also care much about the performance of the implementation (that's the
+reason I rewrote the whole thing in Go, right?), so please make sure that your
+change does not result in performance regression. Please be minded that we
+still don't have a quantitative measure of the performance.
+
+License
+-------
+
+- [MIT](LICENSE)