Add in release github action

Signed-off-by: Matthew B White <[email protected]>

.github/workflows/go.yml

@@ -3,6 +3,7 @@ name: Go
 on:
   push:
     branches: [ main ]
+    tags: [ v** ]
   pull_request:
     branches: [ main ]
   workflow_dispatch:
@@ -37,3 +38,9 @@ jobs:
         name: binaries
         path: |
           bin/
+          
+    - name: Release
+      uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: bin/

.gitignore

@@ -1 +1 @@
-bin
+bin

RELEASING.md

@@ -0,0 +1,13 @@
+# How to release a new version
+
+- In the github.com ui [Release page](https://github.com/IBM/idemix/releases) click on _'Draft a new release'_
+- Select _'Choose a tag'_ and enter a new tag of the format  `v0.0.3` or whatever the next number should be
+    - note the action workflow later is expecting the tag to start with a 'v'
+    - this balances some degree of consistency but with flexability to create tags say `v1.0.0-beta-2`
+    - Please see the [Go notes on module versions](https://go.dev/doc/modules/version-numbers) for more information 
+ - Enter a title - typically something like `Idemix v0.0.3` but no requirements
+- The description is free-form - any information on noteable updates can be made. Also the _'generate release notes'_ button is very good at getting a basic changelog.
+- Click _'Publish release'_ 
+
+A new release is created, with a tag that can be used in `go get` commands
+But also a github action is run to attache the idemix binaries to the release notes automatically.