Add AsciiDoc converter output

README.md

@@ -8,6 +8,7 @@ Supported output formats:
 - LaTeX (`--type=latex`)
 - Markdown (`--type=md`)
 - Org mode (`--type=org`)
+- AsciiDoc (`--type=adoc`)
 
 Highlights are grouped by book title while preserving the order in which
 books first appear in the input file.
@@ -82,6 +83,25 @@ Highlighted text line 2
 *** Notes
 ```
 
+### AsciiDoc
+
+Books and clipping metadata become section headings. Highlight text is placed
+in a quote block followed by an empty notes section:
+
+```adoc
+== Book Title
+
+=== - Your Highlight on Location 123-125 | Added on ...
+
+[quote]
+____
+Highlighted text line 1
+Highlighted text line 2
+____
+
+==== Notes
+```
+
 ## Architecture
 
 Input parsing is implemented as a stage-driven pipeline with one handler for
@@ -140,6 +160,15 @@ Generate Org mode:
   --type=org
 ```
 
+Generate AsciiDoc:
+
+```bash
+./build/kindle2notes \
+  --input "My Clippings.txt" \
+  --output notes.adoc \
+  --type=adoc
+```
+
 Short options are also available:
 
 ```bash
@@ -150,7 +179,7 @@ Short options are also available:
 | --- | --- | --- |
 | `--input` | `-i` | Path to the Kindle clippings file |
 | `--output` | `-o` | Path to the generated file |
-| `--type` | `-t` | Output format: `latex`, `md`, or `org` |
+| `--type` | `-t` | Output format: `latex`, `md`, `org`, or `adoc` |
 | `--help` | `-h` | Show usage information |
 
 If an unsupported output type is requested, the program prints the list of