增加pg_rman文档

doc/pgrman.md

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+## Ubuntu 安装
+
+### 依赖
+```
+sudo apt-get install postgresql-server-dev-all
+
+sudo apt-get install libselinux1-dev libzstd-dev liblz4-dev libpam0g-dev libkrb5-dev libreadline-dev
+sudo apt-get install clang-14
+
+```
+
+### 编译
+```
+
+git clone https://github.com/ossc-db/pg_rman.git
+cd pg_rman
+
+make
+
+make install
+
+```
+
+
+
+## 初始化
+
+
+```
+
+/usr/lib/postgresql/15/bin/pg_rman init \
+    -B /data/postgresql/backup \
+    -D /var/lib/postgresql/15/main/ \
+    -G /etc/postgresql/15/main/postgresql.conf \
+    -A /data/postgresql/wal/ \
+    -S /var/log/postgresql/
+```
+
+
+## 全量备份
+
+```
+PGPASSWORD=abc@123 /usr/lib/postgresql/15/bin/pg_rman backup -b f -B /data/postgresql/backup -D /var/lib/postgresql/15/main/ -G /etc/postgresql/15/main/postgresql.conf -A /data/postgresql/wal/ -S /var/log/postgresql/ -d coal_master -h localhost -p 5432 -U postgres
+
+/usr/lib/postgresql/15/bin/pg_rman validate -B /data/postgresql/backup/
+/usr/lib/postgresql/15/bin/pg_rman show -B /data/postgresql/backup/
+
+```