Update README.md

src/README.md

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-# Running from source
-Work in progress
+# Running From Source
+If you would like to run Picocrypt from source, or an executable isn't available for your platform, you've come to the right place. Running from source is very simple, and I've made it very straightforward by writing specific instructions for each platform.
+
+# Windows
+1. Install the Go Programming Language from <a href="https://golang.org/dl">here</a>.
+2. Download the source file `Picocrypt.go` from above.
+3. Install Picocrypt's dependencies:
+```cmd
+go get -u -v github.com/pkg/browser && go get -u -v github.com/zeebo/blake3 && go get -u -v golang.org/x/crypto/sha3 && go get -u -v golang.org/x/crypto/argon2 && go get -u -v github.com/AllenDang/giu && go get -u -v github.com/OpenDiablo2/dialog && go get -u -v golang.org/x/crypto/blake2b && go get -u -v golang.org/x/crypto/blake2s && go get -u -v github.com/atotto/clipboard && go get -u -v github.com/klauspost/reedsolomon && go get -u -v golang.org/x/crypto/chacha20poly1305 && go get -u -v github.com/HACKERALERT/Picocypher/monocypher
+```
+4. Open a Command Prompt in the directory which contains `Picocrypt.go` and build Picocrypt from source:
+```cmd
+go mod init Picocrypt && go mod tidy && go build -ldflags "-s -w -H=windowsgui -extldflags=-static" Picocrypt.go
+```
+5. You should now see `Picocrypt.exe` in your directory. Now, go and download the `sdelete64.exe` from the list above and place it in the same directory as `Picocrypt.exe`.
+6. You are now complete and you can double click `Picocrypt.exe` to run Picocrypt.
+
+# macOS
+Coming soon....
+
+# Linux
+## Debian-based
+On a Debian-based Linux distro, building Picocrypt from source is trivial. Just run this command, which automatically downloads Go, dependencies, builds Picocrypt, etc.:
+```bash
+sudo rm -rf Picocrypt-Builder && mkdir Picocrypt-Builder && cd Picocrypt-Builder && sudo apt-get install -y gcc make curl git tar wget xz-utils libx11-dev libxcursor-dev libxrandr-dev libxinerama-dev libxi-dev libgl1-mesa-dev libxxf86vm-dev libgtk-3-dev xdg-utils && sudo apt-get install -y libglx-dev || echo "" && sudo apt-get install -y xclip || sudo apt-get install xsel && wget https://golang.org/dl/go1.16.4.linux-amd64.tar.gz && sudo tar -C /usr/local -xzf go1.16.4.linux-amd64.tar.gz && export PATH=$PATH:/usr/local/go/bin && go get -u -v github.com/pkg/browser && go get -u -v github.com/zeebo/blake3 && go get -u -v golang.org/x/crypto/sha3 && go get -u -v golang.org/x/crypto/argon2 && go get -u -v github.com/AllenDang/giu && go get -u -v github.com/OpenDiablo2/dialog && go get -u -v golang.org/x/crypto/blake2b && go get -u -v golang.org/x/crypto/blake2s && go get -u -v github.com/atotto/clipboard && go get -u -v github.com/klauspost/reedsolomon && go get -u -v golang.org/x/crypto/chacha20poly1305 && go get -u -v github.com/HACKERALERT/Picocypher/monocypher && go mod init Picocrypt && wget https://raw.githubusercontent.com/HACKERALERT/Picocrypt/main/src/unstable/Picocrypt.go && go mod tidy && go build --ldflags="-s -w" Picocrypt.go && wget https://github.com/upx/upx/releases/download/v3.96/upx-3.96-amd64_linux.tar.xz && tar xf upx-3.96-amd64_linux.tar.xz && mv Picocrypt upx-3.96-amd64_linux && cd upx-3.96-amd64_linux && ./upx --best --lzma -9 -o Picocrypt-UPX Picocrypt && mv Picocrypt-UPX ../ && cd ../ && mv -v Picocrypt-UPX Picocrypt && mv Picocrypt ../ && cd ../ && sudo rm -rf Picocrypt-Builder && echo "Build complete! You can now run the file 'Picocrypt' in this directory with './Picocrypt' or by double clicking it in your file manager. You might have to 'chmod +x Picocrypt'. Enjoy!"
+```
+## Other
+If your distro is not Debian-based, don't worry! Building from source is still very simple.
+1. Install the Go Programming Language from <a href="https://golang.org/dl">here</a>.
+2. Clone this repository using `git clone` or by downloading the master branch.
+3. Open a terminal where `Picocrypt.go` is located (in the `src` directory).
+4. Get Picocrypt's dependencies:
+```bash
+go get -u -v github.com/pkg/browser && go get -u -v github.com/zeebo/blake3 && go get -u -v golang.org/x/crypto/sha3 && go get -u -v golang.org/x/crypto/argon2 && go get -u -v github.com/AllenDang/giu && go get -u -v github.com/OpenDiablo2/dialog && go get -u -v golang.org/x/crypto/blake2b && go get -u -v golang.org/x/crypto/blake2s && go get -u -v github.com/atotto/clipboard && go get -u -v github.com/klauspost/reedsolomon && go get -u -v golang.org/x/crypto/chacha20poly1305 && go get -u -v github.com/HACKERALERT/Picocypher/monocypher
+```
+5. Build from source:
+```bash
+go mod init Picocrypt && go mod tidy && go build -ldflags "-s -w" Picocrypt.go
+```
+6. You're all done. You can now run the file `Picocrypt`.