Merge pull request #5 from Omochice/1

Create Readme. resolve #1

README.md

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+# ✍️Deepl translate cli
+
+## Installation
+
+1. Download zipped file from [Releases](https://github.com/Omochice/deepl-translate-cli/releases).
+
+2. Unzip downloaded file.
+
+3. Move executable file into directory in PATH. (like `$HOME/.local/bin/`)
+
+
+## Before using
+
+1. Get deepl access token. See [here](https://www.deepl.com/docs-api).
+
+2. Set access token as `DEEPL_TOKEN`
+ ex. in `Bash`.
+ ```bash
+ export DEEPL_TOKEN <YOUR TOKEN>
+ ```
+
+3. Make configure file in `<user home directory>/.config/deepl-translation/setting.json`.
+
+    If run command without existing setting file, auto make it.
+
+    For write setting file, see [this page](https://www.deepl.com/docs-api/translating-text/request/).
+
+## Usage
+
+- If you want translate from existing file.
+```console
+$ deepl-translate <text.txt>
+```
+
+- If you want use stdin.
+    - with pipe 
+        ```console
+        $ echo "hello" | deepl-translation --stdin
+        ```
+    - with input
+        ```console
+        $ deepl-translation --stdin
+        <input text that wanted translate> <Enter>
+        ```