Add README

README.md

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+# zmk-javelin-steno
+
+ZMK module that integrates the [Javelin steno engine](https://github.com/jthlim/javelin-steno) for on-board stenography on ZMK keyboards.
+
+## Status
+
+Work in progress. Engine compiles and initializes. Dictionary auto-downloads and compiles during build. Requires sufficient flash for the compiled dictionary (~3-4MB for full Plover/Lapwing). Currently focused on nRF52840 boards with 1MB flash (nice_nano_v2). Not yet tested on boards with more flash or external QSPI.
+
+## Requirements
+
+- ZMK v0.3.0
+- nRF52840-based board (nice_nano_v2, etc.)
+- Split keyboard: steno runs on central half only
+
+## Setup
+
+Add to your `west.yml`:
+
+```yaml
+manifest:
+  remotes:
+    - name: afiqzudinhadi
+      url-base: https://github.com/afiqzudinhadi
+    - name: jthlim
+      url-base: https://github.com/jthlim
+  projects:
+    - name: zmk-javelin-steno
+      remote: afiqzudinhadi
+      revision: main
+    - name: javelin-steno
+      remote: jthlim
+      revision: main
+      path: zmk-javelin-steno/javelin
+```
+
+Add to your `.conf`:
+
+```ini
+CONFIG_ZMK_JAVELIN_STENO=y
+CONFIG_ZMK_JAVELIN_STENO_DICT_PLOVER=y
+CONFIG_CPLUSPLUS=y
+CONFIG_LIB_CPLUSPLUS=y
+CONFIG_HEAP_MEM_POOL_SIZE=32768
+```
+
+Add to your `.keymap`:
+
+```dts
+#include <dt-bindings/zmk/javelin_steno.h>
+#include <behaviors/javelin_steno.dtsi>
+
+steno_layer {
+    bindings = <
+        &javsteno STENO_S1  &javsteno STENO_TL  &javsteno STENO_PL ...
+    >;
+};
+```
+
+## Known Issues
+
+- Plover and Lapwing dictionaries exceed nRF52840 flash (1MB). Dictionary embedding works but linker rejects due to flash overflow.
+- Boards with external QSPI flash (like the original Javelin hardware) would not have this limitation.
+
+## License
+
+This module is a bridge layer. The Javelin steno engine itself is licensed under [PolyForm Noncommercial 1.0.0](https://polyformproject.org/licenses/noncommercial/1.0.0/).