Add .git related files

.gitattributes

+vendor/**/* -diff

.gitignore

+.idea/

.golangci.yml

+run:
+  deadline: 5m
+  skip-dirs:
+    - vendor/
+    - .*fakes/
+    - .*generated/
+  skip-files:
+    - .*generated.go
+
+linters:
+  disable-all: true
+  enable:
+    - megacheck
+    - govet
+    - deadcode
+    - errcheck
+    - goconst
+    - gocyclo
+    - goimports
+    - revive
+    - gosec
+    - ineffassign
+    - nakedret
+    - staticcheck
+    - structcheck
+    - unconvert
+    - varcheck
+    - vet
+    - vetshadow
+    - misspell
+    - staticcheck

README.md

-# sign
+# signer
+
+Signer service creates and verifies digital signatures, verifiable credentials and verifiable presentations.
 
-Sign service generates verifiable credentials and presentations with signatures.
\ No newline at end of file