Update and rename README to README.md

Change to .md and use markdown to see good.

README.md

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+DirectEdit
+=============
+
+These are scripts for users of MyDNS.JP and are necessary to obtain server certificates with Let's Encrypt's DNS-01.
+
+これらは、MyDNS.JPのユーザーのためのスクリプトで、Let's EncryptのDNS-01でサーバー証明書を取得するために必要です。
+
+必要環境
+-------------
+phpが/usr/bin/下に設置されているサーバ
+
+Let's Encryptが使用可能なサーバ
+
+phpの拡張機能、php-mbstringが有効化されていること
+
+
+使い方/Usage
+-------------
+
+*STEP1:*
+
+    cd /your/domain/directory/
+    wget 'https://github.com/disco-v8/DirectEdit/archive/master.zip' -O DirectEdit-master.zip
+    unzip ./DirectEdit-master.zip
+    cd /your/domain/directory/DirectEdit-master/
+    chmod 700 ./*.php
+    chmod 600 ./*.conf
+
+
+*STEP2:*
+
+edit "txtedit.conf".
+
+    $MYDNSJP_MASTERID  = 'yourmasterid';
+    $MYDNSJP_MASTERPWD = 'yourpasswd';
+    $MYDNSJP_DOMAIN = 'yourdomain';
+
+
+*STEP3:*
+
+    certbot certonly --manual \
+    --preferred-challenges=dns \
+    --manual-auth-hook /your/domain/directory/DirectEdit-master/txtregist.php \
+    --manual-cleanup-hook /your/domain/directory/DirectEdit-master/txtdelete.php \
+    -d yourdomain -d *.yourdomain \
+    --server https://acme-v02.api.letsencrypt.org/directory \
+    --agree-tos -m yourmailaddr \
+    --manual-public-ip-logging-ok
+
+
+**Congratulations! or NOT? :-)**
+
+AFTER:
+**Do not forget** to run "certbot renew" once every few weeks.
+
+Thanks.
+
+T.Kabu/MyDNS.JP