Update descriptions

Author: kanga333

README.md

@@ -1 +1,55 @@
 # json-array-builder
+
+![test](https://github.com/kanga333/json-array-builder/workflows/test/badge.svg)
+
+The `kanga333/json-array-builder` action is a TypeScript action that helps you to build JSON array to be used in dynamic matrix job.
+
+## Examples
+
+This workflow decides the parameter to be used in the dynamic matrix at the job of `matrix_input`.
+After that, `dynamic_matrix` runs jobs in parallel based on the parameters passed to it.
+
+```yaml
+name: 'example'
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+jobs:
+  matrix_input:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: kanga333/json-array-builder@master
+        id: array
+        with:
+          # Using this repository as an example, the output of the command is
+          # builder.ts
+          # execer.ts
+          # main.ts
+          cmd: ls src
+          separator: newline
+    outputs:
+      param: ${{ steps.array.outputs.build }}
+  dynamic_matrix:
+    needs:
+      - matrix_input
+    strategy:
+      matrix:
+        # Three matrix jobs work, builder.ts, execer.ts. main.ts
+        param: ${{ fromJson(needs.matrix_input.outputs.param) }}
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          echo ${{ matrix.param }}
+```
+
+## Inputs
+
+|  name  |  description  |  default  |
+| ---- | ---- | ---- |
+|  str  |  String to split by separator to build JSON array. str cannot be used with cmd at the same time.  |  |
+|  cmd  |  Execute the given command and use the stdout to split by separator to build JSON array. str cannot be used with cmd at the same time.  |  |
+|  separator  |  String to separate a given input. If you need to separate by '\n', please specify the value as 'newline'. Also, if you need to separate by ' ', please specify the value as 'space'.  |  newline  |
+|  json_array  |   If given JSON array string, this action appends to it.  | |

action.yml

@@ -1,5 +1,5 @@
 name: 'json-array-builder'
-description: 'Build JSON array from string'
+description: 'Build JSON array to be used in dynamic matrix job'
 author: 'kanga333'
 inputs:
   str:

package.json

@@ -19,8 +19,7 @@
   },
   "keywords": [
     "actions",
-    "node",
-    "setup"
+    "json"
   ],
   "author": "",
   "license": "MIT",