Add post for flygrep

docs/_posts/2018-01-23-grep-on-the-fly-in-spacevim.md

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+---
+title: "FlyGrep in SpaceVim"
+categories: feature
+excerpt: "Run grep Asynchronously and on the fly as you type in SpaceVim, quick searching whole project or opened files."
+image: https://user-images.githubusercontent.com/13142418/34907415-c2cf7e88-f843-11e7-92d3-ef0f9b1b72ae.gif
+---
+
+# Asynchronous grep on the fly in SpaceVim
+
+FlyGrep means **grep on the fly**, it will update the result as you type. of caulse, it is running
+asynchronously. before using this feature, you need to install a searching tool. FlyGrep can be
+interfaced with different searching tools like: `ag`, `rg`, `ack`, `pt` and `grep`, select any one
+you like.
+
+With this feature, you can:
+
+- Searching in current file
+- Searching in all loaded buffers
+- Searching in an arbitrary directory
+- Searching in a project
+- Background searching in a project
+
+## Searching in current file
+
+
+
+
+## Searching in all loaded buffers
+## Searching in an arbitrary directory
+## Searching in a project
+## Background searching in a project