Update README.md

add go install

Author: cyclone-github

README.md

@@ -76,11 +76,12 @@ To use hashgen, type your mode, wordlist input & hash output files with a simple
 ### Compile hashgen from source:
 - If you want the latest features, compiling from source is the best option since the release version may run several revisions behind the source code.
 - This assumes you have Go and Git installed
-  - `git clone https://github.com/cyclone-github/hashgen.git`
-  - `cd hashgen`
-  - `go mod init hashgen`
-  - `go mod tidy`
-  - `go build -ldflags="-s -w" hashgen.go`
+  - `git clone https://github.com/cyclone-github/hashgen.git`  # clone repo
+  - `cd hashgen`                                               # enter project directory
+  - `go mod init hashgen`                                      # initialize Go module (skips if go.mod exists)
+  - `go mod tidy`                                              # download dependencies
+  - `go build -ldflags="-s -w" .`                              # compile binary in current directory
+  - `go install -ldflags="-s -w" .`                            # compile binary and install to $GOPATH
 - Compile from source code how-to:
   - https://github.com/cyclone-github/scripts/blob/main/intro_to_go.txt