update readme with build instructions

README.md

@@ -1,2 +1,46 @@
 ### Tactical RMM Agent
 https://github.com/wh1te909/tacticalrmm
+
+
+### Building the windows agent with custom branding
+Download and install the following prereqs
+- [TDM-GCC](https://github.com/jmeubank/tdm-gcc/releases/download/v9.2.0-tdm64-1/tdm64-gcc-9.2.0.exe)
+- [Golang](https://golang.org/dl/go1.15.3.windows-amd64.msi)
+- [Inno Setup](https://jrsoftware.org/isdl.php)
+- [Git bash](https://github.com/git-for-windows/git/releases/download/v2.29.1.windows.1/Git-2.29.1-64-bit.exe)
+
+
+Run the following commands in git bash
+```
+mkdir c:/users/public/documents/rmmagent && cd c:/users/public/documents/rmmagent
+git clone https://github.com/wh1te909/rmmagent.git .
+go mod download
+go get github.com/tc-hib/goversioninfo/cmd/goversioninfo
+```
+
+Read through the code / build files and change all references of ```Tactical RMM``` to ```Your Company RMM```
+
+Do __not__ change any of the following or this will break on the RMM end
+- The service names of the 2 windows services ```tacticalagent``` and ```checkrunner```. You can however change the display names and descriptions of these.
+- The ```TacticalAgent``` folder name in Program Files.
+- The actual binary name ```tacticalrmm.exe```. Change the ```FileDescription``` in ```versioninfo.json``` which is what will show up in task manager.
+
+Build the 64 bit agent
+```
+goversioninfo -64
+env CGO_ENABLED=1 GOARCH=amd64 go build -o tacticalrmm.exe
+"c:/Program Files (x86)\Inno Setup 6\ISCC.exe" build/setup.iss
+```
+
+Build the 32 bit agent
+```
+rm resource.syso tacticalrmm.exe
+goversioninfo
+env CGO_ENABLED=1 GOARCH=386 go build -o tacticalrmm.exe
+"c:/Program Files (x86)\Inno Setup 6\ISCC.exe" build/setup-x86.iss
+```
+
+Binaries will be in ```build\Output```
+
+From the RMM, choose the 'Manual' method when generating an agent to get the command line args to pass to the binary.
+