Create install.md

create install guide

nvim/install.md

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+# installing [neovim](https//:gitHub.com/neovim/neovim) from source 
+
+step by step install 
+
+1.install this packages 
+
+```
+sudo apt install ninja-build gettext cmake unzip curl
+```
+
+2. clone the neovim repository
+
+```
+git clone [email protected]:neovim/neovim.git
+```
+
+3. cd to neovim and go to the latest branch
+
+```
+$ cd neovim git checkout stable 
+```
+
+4. activate cmake and make the magic work
+
+```
+$ make CMAKE_BUILD_TYPE=RelWithDebInfo
+```
+
+5. activate the make install on the neovim directory 
+
+```
+$ sudo make install
+```