README: adding install and usage

Signed-off-by: Vincent Batts <[email protected]>

Author: vbatts

README.md

@@ -2,4 +2,55 @@
 
 A way to do per git commit validation
 
+## install
 
+```bash
+vbatts@valse ~ (master) $ go get -u github.com/vbatts/git-validation
+```
+
+## usage
+
+```bash
+vbatts@valse ~/src/vb/git-validation (master) $ git-validation 
+ * d614ccf "*: run tests in a runner" ... PASS
+ * b9413c6 "shortsubject: add a subject length check" ... PASS
+ * 5e74abd "*: comments and golint" ... PASS
+ * 07a982f "git: add verbose output of the commands run" ... PASS
+ * 03bda4b "main: add filtering of rules to run" ... PASS
+ * c10ba9c "Initial commit" ... PASS
+vbatts@valse ~/src/vb/git-validation (master) $ git-validation -v
+ * d614ccf "*: run tests in a runner" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+ * b9413c6 "shortsubject: add a subject length check" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+ * 5e74abd "*: comments and golint" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+ * 07a982f "git: add verbose output of the commands run" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+ * 03bda4b "main: add filtering of rules to run" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+ * c10ba9c "Initial commit" ... PASS
+  - PASS - has a valid DCO
+  - PASS - commit subject is 72 characters or less! *yay*
+```
+
+Here's a failure:
+```bash
+vbatts@valse ~/src/vb/git-validation (master) $ git-validation 
+ * 49f51a8 "README: adding install and usage" ... FAIL
+  - FAIL - does not have a valid DCO
+ * d614ccf "*: run tests in a runner" ... PASS
+ * b9413c6 "shortsubject: add a subject length check" ... PASS
+ * 5e74abd "*: comments and golint" ... PASS
+ * 07a982f "git: add verbose output of the commands run" ... PASS
+ * 03bda4b "main: add filtering of rules to run" ... PASS
+ * c10ba9c "Initial commit" ... PASS
+1 issues to fix
+vbatts@valse ~/src/vb/git-validation (master) $ echo $?
+1
+```