update readme

Author: ciur

README.md

@@ -1,3 +1,22 @@
 # Generate Docker Compose for Papermerge DMS
 
 
+## Installation
+
+Both `pmcompose` and `pmcompose_templates` folder must be located
+in same place, as `pmcompose` looks up `pmcompose_templates` folder
+relative to itself.
+For example if `pmcompose` is located in `/usr/local/bin`, then `pmcompose_templates`
+must be in `/usr/local/bin/pmcompose_templates`.
+
+
+## Usage
+
+Just invoke the binary
+
+```
+$ pmcompose
+```
+
+You will be asked, in interactive session, about different parameters.
+Docker compose file will be written in current working directory.