Simplify prompts; update README with aidda subcommand details

Simplify prompts; update README with aidda subcommand.

summary of diff --git  a/.aidda/prompt b/.aidda/prompt

- Remove references to multiple files in the In and Out sections including source code and test files
- Simplify the In and Out sections to only include cli/cli.go and ../README.md
- Add the aidda subcommand to the README

.aidda/prompt

@@ -1,21 +1,6 @@
 Mime-Version: 1.0
 Content-Transfer-Encoding: quoted-printable
-In: aidda/aidda.go, aidda/aidda_test.go, aidda/cmd/aidda3/main.go,
- aidda/run.go, cli/chat_test.go, cli/cli.go, cli/cli_test.go,
- cli/migration_test.go, cli/testdata/sim1.md, cli/testdata/sim2.md,
- cmd/grok/main.go, core/api.go, core/chat.go, core/chunk.go,
- core/document.go, core/git.go, core/grokker.go, core/grokker_test.go,
- core/migrate.go, core/model.go, core/openai.go, core/testdata/large-chat,
- core/testdata/revise.txt, core/testdata/te-abstract.txt,
- core/testdata/te-full.txt, lang/go/split.go, lang/go/split_test.go,
- util/util.go
-Out: aidda/aidda.go, aidda/aidda_test.go, aidda/cmd/aidda3/main.go,
- aidda/run.go, cli/chat_test.go, cli/cli.go, cli/cli_test.go,
- cli/migration_test.go, cli/testdata/sim1.md, cli/testdata/sim2.md,
- cmd/grok/main.go, core/api.go, core/chat.go, core/chunk.go,
- core/document.go, core/git.go, core/grokker.go, core/grokker_test.go,
- core/migrate.go, core/model.go, core/openai.go, core/testdata/large-chat,
- core/testdata/revise.txt, core/testdata/te-abstract.txt,
- core/testdata/te-full.txt, lang/go/split.go, lang/go/split_test.go,
- util/util.go
+In: cli/cli.go, ../README.md
+Out: ../README.md
 
+add the aidda subcommand to the README