ignore autogenerated files

They will create unnecessary merge conflicts every time people
pull stuff from here.

repo-utils#1 (comment)

Author: rlidwka

.gitignore

@@ -5,3 +5,10 @@
 
 node_modules
 coverage
+
+# autogenerated files ignored in repo-utils/badgeboard
+# to avoid downstream merge conflicts
+#
+# remove this when you're creating a real badgeboard
+/index.html
+/src/db.json

README.md

@@ -2,6 +2,8 @@
 
 ```sh
 ~/your-org.github.io$ git pull https://github.com/repo-utils/badgeboard.git
+~/your-org.github.io$ make ; make db
+~/your-org.github.io$ git commit index.html src/db.json -m 'rebuild'
 ~/your-org.github.io$ git push
 ```
 
@@ -15,12 +17,15 @@ Change:
 
 - src/maintainers.json
 - src/projects.json
+- .gitignore (unignore autogenerated files)
 
 Make it:
 
 ```
 ~/your-org.github.io$ make db
 ~/your-org.github.io$ make
+~/your-org.github.io$ git add src/db.json index.html
+~/your-org.github.io$ git commit src/db.json index.html -m 'rebuild'
 ```
 
 Test it: