Fix shard cli

.gitignore

@@ -2,3 +2,4 @@
 .*.swp
 build
 .gradle
+.idea

README.md

@@ -1,11 +1,53 @@
-Usage
+zarr2zarr
 =====
+This tool converts back and forth OME-zarr files from 
+[zarr-v2](https://zarr-specs.readthedocs.io/en/latest/v2/v2.0.html) 
+to [zarr-v3](https://zarr-specs.readthedocs.io/en/latest/v3/core/v3.0.html).
+standard.
 
-Convert v2 (from e.g. bioformats2raw) to v3:
 
-$ bin/zarr2zarr v2.zarr v3.zarr
+## Installation
+### zarr2zarr
+1. Clone the repository
+```dtd
+git clone https://github.com/glencoesoftware/zarr2zarr.git
+```
 
-Convert v3 to v2:
+2. Build the app and skip the tests
+```dtd
+gradle build -x test
+```
 
-$ bin/zarr2zarr v3.zarr v2-output.zarr --write-v2
+3. Extract the content of the zip (or tar) file 
+``` dtd
+/build/distributions/zarr2zarr-VERSION.zip`
+```
+
+### blosc
+This application needs [blosc](https://github.com/Blosc/c-blosc) to run properly. If you don't have it installed, 
+you can [install it or download the pre-built dll](https://github.com/glencoesoftware/bioformats2raw?tab=readme-ov-file#requirements).
+
+## Usage
+
+- Open a terminal under the bin folder
+````dtd
+/build/distributions/zarr2zarr-VERSION/bin
+````
+
+- Write down the following command to convert a **zarr-v2 file to a zarr-v3 file**
+```dtd
+$ /zarr2zarr v2.zarr v3.zarr
+```
+where `v2.zarr` and `v3.zarr` are absolute path.
+
+- Write down the following command to convert a **zarr-v3 file to a zarr-v2 file**
+```dtd
+$ /zarr2zarr v3.zarr v2-output.zarr --write-v2
+```
+where `v2-output.zarr` and `v3.zarr` are absolute path.
+
+- Several parameters can be added as arguments (chunk, shard...). You can have a look to them by calling the help
+```dtd
+$ /zarr2zarr --help
+```
 

src/main/java/com/glencoesoftware/zarr/Convert.java

@@ -150,7 +150,7 @@ public void setChunk(String chunk) {
   public void setSharding(String shard) {
     if (shard != null && !shard.isEmpty()) {
       try {
-        shardConfig = Enum.valueOf(ShardConfiguration.class, shard);
+        shardConfig = Enum.valueOf(ShardConfiguration.class, shard.toUpperCase());
       }
       catch (IllegalArgumentException e) {
         shardConfig = ShardConfiguration.CUSTOM;