I want to know is any library to work with Microsoft Sharepoint ? Can we program with go language for Microsoft Sharepoint?
Q1: Unfortunately, googling for such library was not successful in my case.
Q2: If MS Sharepoint (whatever that is) has some known or documented API or it can be accessed by some known or documented protocol(s) then the answer is definitely yes.
My best guess is that this will not be possible. Sharepoint as far as I know is an ASP.NET application designed for the Microsoft IIS platform and depends on the closed-source .NET framework.
Working with Sharepoint over APIs though, should be possible but judging by your question I don't think that's what you want.
Sharepoint is many things and it is unclear what you mean by "Can we program with Go for Sharepoint", but you may want to take a look at Sharepoint 2013 apps, which will support "Self-Hosted Apps", that could be written in any language. From the linked article:
You could be a PHP developer with a Linux machine and still make SharePoint apps.
If you're more interested in interacting with Sharepoint's APIs, it looks like Sharepoint 2013 provides a RESTful API, so again, no problem for Go.