feat: Add new usage examples for envset tool

README.md

@@ -20,16 +20,29 @@ cargo install envset
 ### set variables
 
 ```bash
+# basic usage
 envset KEY1=value1 KEY2=value2
+
+# pipe in stdin, useful for copying stuff from one env to another
 echo -e "KEY1=value1\nKEY2=value2" | envset
+
+# .env in the cwd is default, but you can use a different path
 envset --file .env.test KEY1=value1
+
+# avoid clobbering existing values
+envset --no-overwrite KEY1=newvalue1
 ```
 
 ### get variables
 
 ```bash
+# print a single value
 envset get KEY1
+
+# print all key value pairs
 envset print
+
+# print all keys
 envset keys
 ```
 
@@ -38,9 +51,3 @@ envset keys
 ```bash
 envset delete KEY1 KEY2
 ```
-
-### prevent overwriting
-
-```bash
-envset --no-overwrite KEY1=newvalue1
-```