Add .gitignore and go.work.sum. (#6)

## What changes are proposed in this pull request?

Simple PR adding a defensive `.gitignore` file that ignores all private
files and folders at the root by default. Also add the missing
`go.work.sum` file.

## How is this tested?

Verified that the `.gitignore` file work as expected.

Author: renaudhartert-db

.gitignore

@@ -0,0 +1,4 @@
+# Ignore private files and directories by default.
+.*
+!.gitignore
+!.github

go.work.sum

@@ -0,0 +1,26 @@
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