Init code.

README.md

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+# envman
+Envman (environment variable manager) is a simple tool which stores your environment variables so you can easily load them when you want to continue your work.
+
+## Usage
+```
+envman [global options] command [command options] [arguments...]
+
+COMMANDS:
+     list, ls    List the environments or variables in the environment
+     load, l     Load and environment to the current one
+     save, s     Save environment variables to an environment
+     remove, rm  Remove a full environment or just a variable
+     cleanup     Cleanup the backend, delete all the created files
+     help, h     Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --backend value, -b value  Use and set a different backend as default
+   --help, -h                 show help
+   --version, -v              print the version
+```
+
+## Sample commands
+`envman ls`  
+`envman ls ENV_NAME`  
+`envman save ENV_NAME VAR_1 VAR_2`  
+`envman load ENV_NAME`  
+`envman rm ENV_NAME`  
+`envman rm ENV_NAME VAR_1`
+
+## Backend development
+- Implement the Backend interface.
+- If want to use config for your backend add it to the Config struct.
+- In the main package declare it in backend parsing.
+
+## TODO
+- Autocomplete
+- Security: E.g. AES encrypt any text which is uploaded.
+- Display better error messages?
+- Option to rename env?
+### Backends
+#### GitHub Gist
+- Refactor (GraphQL?)

backend/backend.go

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+package backend
+
+import (
+	"github.com/pyrooka/envman/config"
+)
+
+// IBackend is an interface what show what should implement if you want to create a new storage service.
+type IBackend interface {
+	Init(c *config.Config) (err error)                         // Initialize the backend.
+	List(envName string) ([]string, error)                     // Returns a list with the variables in the env or the environments in the backend if the name is empty string.
+	Get(envName string) (vars map[string]string, err error)    // Gets the variables for the environment.
+	Update(envName string, vars map[string]string) (err error) // Updates variables in the environment.
+	Delete(envName string, vars []string) (err error)          // Deletes the given variables or the full environment if an empty slice given.
+	CleanUp() (err error)                                      // Removes all the created things.
+}