README: update the usage and remove Travis

.travis.yml

@@ -1,21 +0,0 @@
-language: go
-go:
-  - 1.7.1
-  - 1.6.3
-  - 1.5.4
-
-sudo: false
-
-before_install:
-  - git config --global url."https://".insteadOf git://
-  - go get -u github.com/golang/lint/golint
-  - mkdir -p $GOPATH/src/github.com/vbatts && ln -sf $(pwd) $GOPATH/src/github.com/vbatts/dedupe-linker
-  - go get ./...
-
-install: true
-
-script:
-  - go vet -x ./...
-  - golint -set_exit_status ./...
-  - go test -v ./...
-  - go build -x github.com/vbatts/dedupe-linker

README.md

@@ -1,11 +1,37 @@
 # dedupe-linker
 
-[![Build Status](https://travis-ci.org/vbatts/dedupe-linker.svg?branch=master)](https://travis-ci.org/vbatts/dedupe-linker)
+Dedupe regular files on a filesystem by hard linking and a creating a content-addressible look-aside.
+
+This defaults to `sha1` checksums, but you can specify others like `sha256` or `sha512`.
+
+This also means that the comparison on whether something is a duplicate is based on checksum, and does not consider mode, owner, or xattrs.
+
+This is really a pet-project, but changes welcome.
+And is only focused on Linux compatability, but changes welcome.
 
 ## Install
 
-```bash
-go get github.com/vbatts/dedupe-linker
+```shell
+go install github.com/vbatts/dedupe-linker@latest
 ```
 
+## Usage
+
+The default look-aside base directory is in `~/.dedupe-linker`, so the following would dedupe your home directory:
+
+```shell
+dedupe-linker -w $(nproc) ~/
+```
+
+Cleaning up from the look-aside needs only to check the links as a ref-count:
+
+```shell
+find ~/.dedupe-linker/ -type f -links 1
+```
+
+Then delete these files that only have 1 reference:
+
+```shell
+find ~/.dedupe-linker/ -type f -links 1 -exec rm -f "{}" \;
+```